schedule: enable placement rules cache default

[HunDunDM]

What problem does this PR solve?

Issue Number: Close #5864

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

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

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

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[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.12%. Comparing base (a99ff9f) to head (798eab7).
Report is 1202 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6085      +/-   ##
==========================================
+ Coverage   73.90%   74.12%   +0.22%     
==========================================
  Files         381      381              
  Lines       37802    37804       +2     
==========================================
+ Hits        27937    28023      +86     
+ Misses       7393     7331      -62     
+ Partials     2472     2450      -22     

Flag	Coverage Δ
unittests	74.12% <100.00%> (+0.22%)	⬆️

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[nolouch]

Any test relative this?

[ti-chi-bot]

PR needs rebase.

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