playground: refine ready message

[xhebox]

What problem does this PR solve?

#2202 (comment)

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

[codecov-commenter]

Codecov Report

Patch coverage: 57.14% and no project coverage change.

Comparison is base (eee25bb) 55.83% compared to head (a599bc3) 55.83%.

❗ Current head a599bc3 differs from pull request most recent head 42cd979. Consider uploading reports for the commit 42cd979 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2262      +/-   ##
==========================================
- Coverage   55.83%   55.83%   -0.00%     
==========================================
  Files         321      321              
  Lines       34017    34022       +5     
==========================================
+ Hits        18991    18993       +2     
- Misses      12754    12755       +1     
- Partials     2272     2274       +2     

Flag	Coverage Δ
playground	15.71% <57.14%> (+0.01%)	⬆️
tiup	15.86% <ø> (ø)
unittest	22.58% <0.00%> (-0.01%)	⬇️

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

Files Changed	Coverage Δ
components/playground/playground.go	46.01% <50.00%> (-0.03%)	⬇️
components/playground/main.go	59.42% <100.00%> (ø)

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kaaaaaaang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-24 18:52:17.671867911 +0000 UTC m=+1434702.220883883: ☑️ agreed by kaaaaaaang.
• 2023-08-24 18:52:35.93019914 +0000 UTC m=+1434720.479215112: ✖️🔁 reset by kaaaaaaang.
• 2023-08-25 10:31:56.057719898 +0000 UTC m=+1491080.606735870: ☑️ agreed by kaaaaaaang.