Migrate stress cpu (#280)

related to #237 


Similar to the other migrated experiments I followed same approach as
described here #268


> The experiment was executed and verified via the integration test
against a self-managed cluster.
> 
> I moved the experiment into the chaos-experiments/camunda-cloud/test/
folder and migrated it, with that approach I was able to execute the
experiment with eze and running against my self-managed zell-chaos zeebe
cluster.


```
Create ChaosToolkit instance
Open workers: [zbchaos, readExperiments].
Handle read experiments job [key: 2251799813685265]
Read experiments successful, complete job with: {"experiments":[{"contributions":{"availability":"high","reliability":"high"},"description":"This fake experiment is just to test the integration with Zeebe and zbchaos workers","method":[{"name":"Show again the version","provider":{"arguments":["version"],"path":"zbchaos","timeout":900,"type":"process"},"tolerance":0,"type":"action"}],"rollbacks":[],"steady-state-hypothesis":{"probes":[{"name":"Show version","provider":{"arguments":["version"],"path":"zbchaos","timeout":900,"type":"process"},"tolerance":0,"type":"probe"}],"title":"Zeebe is alive"},"title":"This is a fake experiment","version":"0.1.0"},{"contributions":{"availability":"high","reliability":"high"},"description":"The cpu stress on an abritrary node should not cause any failures. We should be able to start and complete instances.","method":[{"name":"Stress CPU on Broker","provider":{"arguments":["stress","broker","--cpu"],"path":"zbchaos","type":"process"},"type":"action"}],"rollbacks":[],"steady-state-hypothesis":{"probes":[{"name":"All pods should be ready","provider":{"arguments":["verify","readiness"],"path":"zbchaos","timeout":900,"type":"process"},"tolerance":0,"type":"probe"},{"name":"Can deploy process model","provider":{"arguments":["deploy","process"],"path":"zbchaos","timeout":900,"type":"process"},"tolerance":0,"type":"probe"},{"name":"Should be able to create process instances on partition 1","provider":{"arguments":["verify","instance-creation","--partitionId","1"],"path":"zbchaos","timeout":900,"type":"process"},"tolerance":0,"type":"probe"}],"title":"Zeebe is alive"},"title":"CPU stress on an Broker","version":"0.1.0"}]}.
Handle zbchaos job [key: 2251799813685328]
Running command with args: [version] 
zbchaos development (commit: HEAD)
Handle zbchaos job [key: 2251799813685374]
Running command with args: [version] 
zbchaos development (commit: HEAD)
Handle zbchaos job [key: 2251799813685417]
Running command with args: [version] 
zbchaos development (commit: HEAD)
Handle zbchaos job [key: 2251799813685508]
Running command with args: [verify readiness] 
Connecting to zell-chaos
Running experiment in self-managed environment.
All Zeebe nodes are running.
Handle zbchaos job [key: 2251799813685551]
Running command with args: [deploy process] 
Connecting to zell-chaos
Running experiment in self-managed environment.
Successfully created port forwarding tunnel
Deploy file bpmn/one_task.bpmn (size: 2526 bytes).
Deployed process model bpmn/one_task.bpmn successful with key 2251799813685263.
Deployed given process model , under key 2251799813685263!
Handle zbchaos job [key: 2251799813685595]
Running command with args: [verify instance-creation --partitionId 1] 
Connecting to zell-chaos
Running experiment in self-managed environment.
Successfully created port forwarding tunnel
Send create process instance command, with BPMN process ID 'benchmark' and version '-1' (-1 means latest) [variables: '', awaitResult: false]
Created process instance with key 4503599627370533 on partition 2, required partition 1.
Send create process instance command, with BPMN process ID 'benchmark' and version '-1' (-1 means latest) [variables: '', awaitResult: false]
Created process instance with key 6755399441055781 on partition 3, required partition 1.
Send create process instance command, with BPMN process ID 'benchmark' and version '-1' (-1 means latest) [variables: '', awaitResult: false]
Created process instance with key 2251799813685304 on partition 1, required partition 1.
The steady-state was successfully verified!
Handle zbchaos job [key: 2251799813685642]
Running command with args: [stress broker --cpu] 
Connecting to zell-chaos
Running experiment in self-managed environment.
Successfully created port forwarding tunnel
Found Broker zell-chaos-zeebe-0 as LEADER for partition 1.
Put stress on zell-chaos-zeebe-0
Execute ["apt" "-qq" "update"] on pod zell-chaos-zeebe-0
Execute ["apt" "-qq" "install" "-y" "stress" "procps"] on pod zell-chaos-zeebe-0
Execute ["stress" "--timeout" "30" "--cpu" "256"] on pod zell-chaos-zeebe-0
Handle zbchaos job [key: 2251799813685871]
Running command with args: [verify readiness] 
Connecting to zell-chaos
Running experiment in self-managed environment.
All Zeebe nodes are running.
Handle zbchaos job [key: 2251799813685913]
Running command with args: [deploy process] 
Connecting to zell-chaos
Running experiment in self-managed environment.
Successfully created port forwarding tunnel
Deploy file bpmn/one_task.bpmn (size: 2526 bytes).
Deployed process model bpmn/one_task.bpmn successful with key 2251799813685263.
Deployed given process model , under key 2251799813685263!
Handle zbchaos job [key: 2251799813685977]
Running command with args: [verify instance-creation --partitionId 1] 
Connecting to zell-chaos
Running experiment in self-managed environment.
Successfully created port forwarding tunnel
Send create process instance command, with BPMN process ID 'benchmark' and version '-1' (-1 means latest) [variables: '', awaitResult: false]
Created process instance with key 4503599627370539 on partition 2, required partition 1.
Send create process instance command, with BPMN process ID 'benchmark' and version '-1' (-1 means latest) [variables: '', awaitResult: false]
Created process instance with key 6755399441055787 on partition 3, required partition 1.
Send create process instance command, with BPMN process ID 'benchmark' and version '-1' (-1 means latest) [variables: '', awaitResult: false]
Created process instance with key 2251799813685311 on partition 1, required partition 1.
The steady-state was successfully verified!
Instance 2251799813685257 [definition 2251799813685253 ] completed
--- PASS: Test_ShouldBeAbleToRunExperiments (32.20s)
PASS

Process finished with the exit code 0

```

go-chaos/internal/chaos-experiments/camunda-cloud/production-s/stress-cpu-on-broker/experiment.json

@@ -15,7 +15,19 @@
                 "tolerance": 0,
                 "provider": {
                     "type": "process",
-                    "path": "verify-readiness.sh",
+                    "path": "zbchaos",
+                    "arguments": ["verify", "readiness"],
+                    "timeout": 900
+                }
+            },
+            {
+                "name": "Can deploy process model",
+                "type": "probe",
+                "tolerance": 0,
+                "provider": {
+                    "type": "process",
+                    "path": "zbchaos",
+                    "arguments": ["deploy", "process"],
                     "timeout": 900
                 }
             },
@@ -25,8 +37,8 @@
                 "tolerance": 0,
                 "provider": {
                     "type": "process",
-                    "path": "verify-steady-state.sh",
-                    "arguments": "1",
+                    "path": "zbchaos",
+                    "arguments": ["verify", "instance-creation", "--partitionId", "1"],
                     "timeout": 900
                 }
             }
@@ -38,7 +50,8 @@
             "name": "Stress CPU on Broker",
             "provider": {
                 "type": "process",
-                "path": "stress-cpu.sh"
+                "path": "zbchaos",
+                "arguments": ["stress", "broker", "--cpu"]
             }
         }
     ],