tidb: set tidb support set label min version to v6.3.0

[glorv]

What problem does this PR solve?

What is changed and how does it work?

The least version that tidb support set server labels via HTTP is v6.3.0, so we should skip set labels before this version.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• KanShiori
• csuzhangxc

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[glorv]

/cc @KanShiori @handlerww

[codecov-commenter]

Codecov Report

Merging #4724 (ca68193) into master (24554a9) will increase coverage by 7.60%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4724      +/-   ##
==========================================
+ Coverage   61.58%   69.18%   +7.60%     
==========================================
  Files         206      210       +4     
  Lines       22750    25492    +2742     
==========================================
+ Hits        14010    17637    +3627     
+ Misses       7441     6558     -883     
+ Partials     1299     1297       -2     

Flag	Coverage Δ
e2e	52.76% <ø> (?)
unittest	61.56% <ø> (-0.02%)	⬇️

[KanShiori]

/test pull-e2e-kind-br

[KanShiori]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ca68193