chore: let workflow pr branch pattern match feature branch

[purelind]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-27 07:49:57.507054031 +0000 UTC m=+77532.863058545: ☑️ agreed by rleungx.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rleungx

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (feature/release-7.5.1-20241126@130fc97). Learn more about missing BASE report.

Additional details and impacted files

@@                        Coverage Diff                        @@
##             feature/release-7.5.1-20241126    #8954   +/-   ##
=================================================================
  Coverage                                  ?   75.11%           
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  Files                                     ?      444           
  Lines                                     ?    66289           
  Branches                                  ?        0           
=================================================================
  Hits                                      ?    49795           
  Misses                                    ?    13226           
  Partials                                  ?     3268           

Flag	Coverage Δ
unittests	75.11% <ø> (?)

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