make pd start timeout configurable (#5071)

[ti-chi-bot]

This is an automated cherry-pick of #5071

What problem does this PR solve?

make pd start timeout configurable

What is changed and how does it work?

Update pd start timeout value to make it configurable

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.

[ti-chi-bot]

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[csuzhangxc]

/test pull-e2e-kind

[ti-chi-bot]

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@csuzhangxc: No presubmit jobs available for pingcap/[email protected]

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[codecov-commenter]

Codecov Report

Merging #5095 (50a9b8f) into release-1.5 (3dc9543) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5095      +/-   ##
===============================================
- Coverage        59.04%   59.03%   -0.02%     
===============================================
  Files              228      228              
  Lines            26514    26516       +2     
===============================================
- Hits             15656    15653       -3     
- Misses            9324     9327       +3     
- Partials          1534     1536       +2     

Flag	Coverage Δ
unittest	59.03% <100.00%> (-0.02%)	⬇️