playground: wait PD ready before starting TiDB to avoid cluster ID mismatch

[amyangfei]

What problem does this PR solve?

close #2678

What is changed and how it works?

Test PD pd/api/v1/members API returns non-zero clusterID in response before starting TiDB server to avoid TiDB server gets incorrect cluster-id

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Test multiple times with tiup playground v6.1.7 --db 1 --pd 1 --kv 3 --tiflash 0

• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

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

Related changes

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

Release notes:

NONE

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.31%. Comparing base (7d025cb) to head (bd05357).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
components/playground/instance/pd.go	90.91%	2 Missing ⚠️
components/playground/playground.go	77.78%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2679      +/-   ##
==========================================
+ Coverage   42.30%   42.31%   +0.01%     
==========================================
  Files         424      424              
  Lines       46888    46919      +31     
==========================================
+ Hits        19834    19853      +19     
- Misses      24390    24398       +8     
- Partials     2664     2668       +4     

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