[r12.0] update workflows for release branches

[cdeepali]

Checklist before submitting

• Did you read the contributor guide?
• Did you update any affected documentation?
• Did you write any tests to validate this change?

Description

Fixes # (issue).

Review process to land

1. All tests and other checks must succeed.
2. At least one maintainer must review and approve.
3. If any maintainer requests changes, they must be addressed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (r12.0.1@0bc8a6a). Click here to learn what that means.

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Additional details and impacted files

@@            Coverage Diff             @@
##             r12.0.1     #213   +/-   ##
==========================================
  Coverage           ?   95.83%           
==========================================
  Files              ?       25           
  Lines              ?     2184           
  Branches           ?        0           
==========================================
  Hits               ?     2093           
  Misses             ?       91           
  Partials           ?        0           

Flag	Coverage Δ
unittests	95.83% <0.00%> (?)

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