[COST-4947] Remove account and region fields from ProviderInfrastructureMap

[cgoodfred]

Jira Ticket

COST-4947

Description

This change will remove account and region from the ProviderInfrastructureMap prior to the migration on the DB.

This follows the suggested flow from the following gist: https://gist.github.com/majackson/493c3d6d4476914ca9da63f84247407b#removing-fields-or-tables

Testing

1. Smokes should pass

Release Notes

• proposed release note

* [COST-4947](https://issues.redhat.com/browse/COST-####) Remove account and region from the ProviderInfrastructureMap model

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.1%. Comparing base (5ac84cc) to head (cc02857).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5076     +/-   ##
=======================================
- Coverage   94.1%   94.1%   -0.0%     
=======================================
  Files        377     377             
  Lines      31346   31344      -2     
  Branches    3715    3715             
=======================================
- Hits       29506   29504      -2     
+ Misses      1175    1173      -2     
- Partials     665     667      +2