feat(minReadySeconds): support minReadySeconds for PD (#5827) #5831
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This is an automated cherry-pick of #5827
What problem does this PR solve?
ref pingcap/tiup#2461
closes #5764
also ref #4675
The better method is to check whether if PD is ready via an API from PD (in later versions)
What is changed and how does it work?
Code changes
Tests
Side effects
Related changes
Release Notes
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