chore: do not always retry load tests requests

[olevski]

Fixes #3240

NOTE: This only affects the load tests. These do not currently run in any CI and are not deployed anywhere.

I cleaned up some unnecessary logging and added some metrics to track the duration of specific requests.

Example output:

          /\      |‾‾| /‾‾/   /‾‾/   
     /\  /  \     |  |/  /   /  /    
    /  \/    \    |     (   /   ‾‾\  
   /          \   |  |\  \ |  (‾)  | 
  / __________ \  |__| \__\ \_____/ .io

  execution: local
     script: class-scenario.js
     output: -

  scenarios: (100.00%) 1 scenario, 4 max VUs, 32m0s max duration (incl. graceful stop):
           * lecture: 1 iterations for each of 4 VUs (maxDuration: 30m0s, gracefulStop: 2m0s)


running (02m48.3s), 0/4 VUs, 4 complete and 0 interrupted iterations
lecture ✓ [======================================] 4 VUs  02m45.3s/30m0s  4/4 iters, 1 per VU

     █ setup

       ✓ request succeeded with 2XX
       ✓ getting project info response has no error

     █ fork

       ✓ request succeeded with 2XX

     █ launch session

       ✓ request succeeded with 2XX

     █ shutdown server

       ✓ request succeeded with 2XX

     █ remove project

       ✓ request succeeded with 2XX

     checks.........................: 100.00% ✓ 218      ✗ 0  
     data_received..................: 804 kB  4.8 kB/s
     data_sent......................: 66 kB   392 B/s
     group_duration.................: avg=38.22s   min=258.37ms med=30.38s   max=1m31s    p(90)=1m31s    p(95)=1m31s   
     http_req_blocked...............: avg=3.46ms   min=0s       med=1µs      max=88.56ms  p(90)=2µs      p(95)=31.42ms 
     http_req_connecting............: avg=1ms      min=0s       med=0s       max=67.78ms  p(90)=0s       p(95)=6.06ms  
     http_req_duration..............: avg=213.34ms min=9.86ms   med=173.57ms max=2.41s    p(90)=272.91ms p(95)=369.76ms
       { expected_response:true }...: avg=213.34ms min=9.86ms   med=173.57ms max=2.41s    p(90)=272.91ms p(95)=369.76ms
     http_req_failed................: 0.00%   ✓ 0        ✗ 312
     http_req_receiving.............: avg=241.16µs min=26µs     med=77µs     max=11.67ms  p(90)=178.3µs  p(95)=1.31ms  
     http_req_sending...............: avg=174.84µs min=55µs     med=180µs    max=350µs    p(90)=232.9µs  p(95)=251.34µs
     http_req_tls_handshaking.......: avg=2.32ms   min=0s       med=0s       max=38.98ms  p(90)=0s       p(95)=24.22ms 
     http_req_waiting...............: avg=212.92ms min=9.6ms    med=173ms    max=2.41s    p(90)=272.65ms p(95)=369.54ms
     http_reqs......................: 312     1.854364/s
     iteration_duration.............: avg=2m12s    min=2.96s    med=2m45s    max=2m45s    p(90)=2m45s    p(95)=2m45s   
     iterations.....................: 4       0.023774/s
     session_create_req_duration....: avg=2.27s    min=2.14s    med=2.28s    max=2.41s    p(90)=2.39s    p(95)=2.4s    
     session_delete_req_duration....: avg=302.63ms min=273.48ms med=305.55ms max=325.95ms p(90)=324.66ms p(95)=325.31ms
     session_get_req_duration.......: avg=185.81ms min=140.13ms med=176.61ms max=754.04ms p(90)=220.88ms p(95)=236.04ms
     session_startup_duration.......: avg=49s      min=49s      med=49s      max=49s      p(90)=49s      p(95)=49s     
     vus............................: 3       min=0      max=4
     vus_max........................: 4       min=4      max=4

[coveralls]

Pull Request Test Coverage Report for Build 6875247711

Warning: This coverage report may be inaccurate.

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A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 16 unchanged lines in 8 files lost coverage.
• Overall coverage decreased (-0.05%) to 82.786%

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Files with Coverage Reduction	New Missed Lines	%
renku/core/dataset/dataset.py	1	79.01%
renku/core/dataset/providers/dataverse.py	1	88.86%
renku/core/migration/models/v3.py	1	97.24%
renku/domain_model/dataset.py	1	92.84%
renku/domain_model/image.py	1	95.65%
renku/ui/cli/init.py	1	96.9%
renku/ui/cli/service.py	1	28.57%
renku/core/dataset/providers/renku.py	9	86.69%

Totals
Change from base Build 6823291196:	-0.05%
Covered Lines:	25441
Relevant Lines:	30731

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💛 - Coveralls