[COST-4643] use cascade_delete to remove expired CostUsageReportManifest

[maskarb]

Jira Ticket

COST-4643

Description

This change will delete manifests via cascade_delete

Testing

1. with some OCP data loaded
2. make shell
3. delete manifests through the ReportManifestDBAccessor methods and see success.

>>> from masu.database.report_manifest_db_accessor import ReportManifestDBAccessor
>>> with ReportManifestDBAccessor() as acc:
...   acc.purge_expired_report_manifest('OCP', '2024-03-10')
[2024-03-13 16:09:19,206] INFO None 83486 Removed 8 CostUsageReportManifest(s) for provider type OCP that had a billing period start date before 2024-03-10

4. my db only had these 8 OCP manifests. Since I deleted everything, I expect both these tables to be empty:

postgres=# select * from reporting_common_costusagereportstatus;
(0 rows)

postgres=# select * from reporting_common_costusagereportmanifest;
(0 rows)

Notes

...

[codecov]

Codecov Report

Merging #4969 (ba4c1ad) into main (704c58d) will decrease coverage by 0.0%.
The diff coverage is 100.0%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4969     +/-   ##
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- Coverage   94.1%   94.0%   -0.0%     
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  Files        375     375             
  Lines      31117   31124      +7     
  Branches    3697    3697             
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+ Hits       29270   29272      +2     
- Misses      1177    1181      +4     
- Partials     670     671      +1