playground: fix redundant log

[nexustar]

What problem does this PR solve?

• fix Redundant log "Waiting for tidb instances ready" #1000

What is changed and how it works?

Check List

Tests

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

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AstroProfundis

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[codecov-commenter]

Codecov Report

Base: 47.65% // Head: 47.65% // No change to project coverage 👍

Coverage data is based on head (4a07f6b) compared to base (42b07cb).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2032   +/-   ##
=======================================
  Coverage   47.65%   47.65%           
=======================================
  Files         308      308           
  Lines       35946    35946           
=======================================
  Hits        17130    17130           
  Misses      16795    16795           
  Partials     2021     2021           

Flag	Coverage Δ
playground	12.94% <100.00%> (ø)
tiup	14.25% <ø> (ø)
unittest	20.80% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/playground/playground.go	49.37% <100.00%> (ø)

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[nexustar]

/merge

[ti-chi-bot]

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

Commit hash: 4a07f6b

[ti-chi-bot]

@nexustar: Your PR was out of date, I have automatically updated it for you.

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