[COST-3761] Generate example API data for several days

[samdoran]

Jira Ticket

COST-3761

Description

Generate several days worth of example data for reports/openshift/network/.
Also add example data for group_by[cluster]=*.

Testing

curl -gsSL http://localhost:8000/api/cost-management/v1/reports/openshift/network/
curl -gsSL http://localhost:8000/api/cost-management/v1/reports/openshift/network/?group_by[cluster]=*

Release Notes

• proposed release note

* [COST-3761](https://issues.redhat.com/browse/COST-3761) Add more example data to OCP Network API

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 94.1%. Comparing base (7cce711) to head (ddce320).

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5085    +/-   ##
======================================
  Coverage   94.1%   94.1%            
======================================
  Files        377     378     +1     
  Lines      31439   31577   +138     
  Branches    3725    3753    +28     
======================================
+ Hits       29592   29723   +131     
- Misses      1176    1181     +5     
- Partials     671     673     +2