ttl: enlarge the max split of TTL job

[lcwangchao]

What problem does this PR solve?

Issue Number: close #57700

What changed and how does it work?

The actual splits = min(tableRegionCount, max(64, tikvStoreCount))

Check List

Tests

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

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

ttl: enlarge the max split of TTL job for large clusters

[tiprow]

Hi @lcwangchao. Thanks for your PR.

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[YangKeao]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.4022%. Comparing base (d02d48a) to head (c28c9d3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57701        +/-   ##
================================================
+ Coverage   72.8318%   73.4022%   +0.5703%     
================================================
  Files          1677       1677                
  Lines        463944     463997        +53     
================================================
+ Hits         337899     340584      +2685     
+ Misses       105169     102659      -2510     
+ Partials      20876      20754       -122     

Flag	Coverage Δ
integration	43.6110% <0.0000%> (?)
unit	72.2189% <100.0000%> (-0.0050%)	⬇️

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

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	45.5202% <ø> (+0.0090%)	⬆️

[bb7133]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, YangKeao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-26 05:00:43.280677511 +0000 UTC m=+526230.900332033: ☑️ agreed by YangKeao.
• 2024-11-26 05:32:39.652529497 +0000 UTC m=+528147.272184012: ☑️ agreed by bb7133.

[hawkingrei]

/retest