Revert "playground: only pull nightly from cluster version (#2364)"

[kaaaaaaang]

This reverts commit 38b6c96.

What problem does this PR solve?

• fix tiup playground can not deploy a right version cluster #2395

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

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.83%. Comparing base (48f15f4) to head (db3303b).

❗ Current head db3303b differs from pull request most recent head 1a90efb. Consider uploading reports for the commit 1a90efb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2397      +/-   ##
==========================================
+ Coverage   55.80%   55.83%   +0.03%     
==========================================
  Files         329      329              
  Lines       35222    35221       -1     
==========================================
+ Hits        19654    19663       +9     
+ Misses      13202    13187      -15     
- Partials     2366     2371       +5     

Flag	Coverage Δ
playground	16.52% <100.00%> (+0.16%)	⬆️
tiup	33.59% <ø> (ø)
unittest	22.16% <0.00%> (+<0.01%)	⬆️

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