add provider-billing-source to sources masu endpoint

[maskarb]

Jira Ticket

COST-####

Description

This change will return the ProviderBillingSource information in masu, in addition to the pks of the authentication and billing info because these are more useful that the unused uuids in these tables.

Testing

1. http://localhost:5042/api/cost-management/v1/sources/
2. in the provider field, see:

            "provider": {
                "uuid": "9bf22647-e18e-4b63-acb3-8ec3ad77330a",
                ....
                "authentication": {
                    "id": 13, <<<<<<<<<<< this is `id` instead of `uuid` now
                    "credentials": {
                        "role_arn": "arn:aws:iam::111111111111:role/CostManagement"
                    }
                },
                "billing_source": { <<<<<<<<< this was missing
                    "id": 10,
                    "data_source": {
                        "bucket": "/tmp/local_bucket_1"
                    }
                },
                ...

## Notes

...

[codecov]

Codecov Report

Merging #4984 (ae953ec) into main (77dbb76) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4984     +/-   ##
=======================================
- Coverage   94.1%   94.1%   -0.0%     
=======================================
  Files        377     377             
  Lines      31321   31327      +6     
  Branches    3711    3711             
=======================================
+ Hits       29478   29483      +5     
  Misses      1174    1174             
- Partials     669     670      +1     

[maskarb]

/retest