Only run github action before raftstore-proxy-6.x

[JaySon-Huang]

What is changed and how it works?

Issue Number: Close #xxx

This is quite disruptively when running PR for the raftstore-proxy-xxx branch which is not use at all.

What's Changed:

Only run the github action when the PR target to raftstore-proxy-xx before 6.x

Related changes

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

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Release note

[ti-chi-bot]

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