Ensure PRS runs for all the shards in TestSemiSyncRequiredWithTwoPC

[GuptaManan100]

Description

Flaky fix done in #17332, was somewhat incomplete. Post the changes, we still had a single shard left that didn't have its primary changed when we ran PRS after changing the keyspace durability policy. This causes the test to be flaky because VTOrc fixing the semi-sync races with the next transaction running.

Related Issue(s)

• RFC: Atomic Distributed Transactions #16245

Checklist

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Deployment Notes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.45%. Comparing base (44aa9d7) to head (220114d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17384      +/-   ##
==========================================
- Coverage   67.47%   67.45%   -0.02%     
==========================================
  Files        1581     1581              
  Lines      253944   253944              
==========================================
- Hits       171353   171309      -44     
- Misses      82591    82635      +44     

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