chore: adding a shard action to do GHA cache cleanup

[mstrisoline]

Description

• adding shared workflow to do cache cleanup on PR merge

Testing required outside of automated testing?

• Not Applicable

Screenshots (if appropriate):

• Not Applicable

Rollback / Rollforward Procedure

• Roll Forward
• Roll Back

Reviewer Checklist

• Description of Change
• Description of outside testing if applicable.
• Description of Roll Forward / Backward Procedure
• Documentation updated for Change