[COST-5328] Fully distribute network unattributed costs

[samdoran]

Jira Ticket

COST-5238
COST-3761

Description

Network unattributed costs are distributed in part by filtering for cost_category_id IS NULL in order to exclude Platform costs from Network unattributed. When putting network costs into their own project, the cost category ID is preserved. This results in some Network unattributed costs not being distributed to user projects.

Testing

1. Checkout Branch
2. Restart Koku
3. Load test customer data with a cost model set to distribute network costs
4. curl "http://localhost:8000/api/cost-management/v1/reports/openshift/costs/?filter%5Bresolution%5D=monthly&group_by%5Bproject%5D=network"
5. Verify that data[0].projects[0].values[0].cost.total.value + data[0].projects[0].values[0].cost.network_unattributed_distributed.value = 0

JSON response snippet

...
                            "cost": {
                                "raw": {
                                    "value": 31.152,
                                    "units": "USD"
                                },
                                "markup": {
                                    "value": 3.1152,
                                    "units": "USD"
                                },
                                "usage": {
                                    "value": 0.0,
                                    "units": "USD"
                                },
                                "platform_distributed": {
                                    "value": 0.0,
                                    "units": "USD"
                                },
                                "worker_unallocated_distributed": {
                                    "value": 0.0,
                                    "units": "USD"
                                },
                                "network_unattributed_distributed": {
                                    "value": -34.2672,
                                    "units": "USD"
                                },
                                "storage_unattributed_distributed": {
                                    "value": 0.0,
                                    "units": "USD"
                                },
                                "distributed": {
                                    "value": 0.0,
                                    "units": "USD"
                                },
                                "total": {
                                    "value": 34.2672,
                                    "units": "USD"
                                }
...

Release Notes

• proposed release note

* [COST-5328](https://issues.redhat.com/browse/COST-5328) Fully distribute Network unattributed costs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.1%. Comparing base (e98441e) to head (5e8ca4b).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5238     +/-   ##
=======================================
- Coverage   94.1%   94.1%   -0.0%     
=======================================
  Files        373     373             
  Lines      31224   31224             
  Branches    4592    4592             
=======================================
- Hits       29383   29375      -8     
- Misses      1175    1181      +6     
- Partials     666     668      +2