resource_group: don't accumulate tokens when burstlimit less than 0 (#7626)

[ti-chi-bot]

This is an automated cherry-pick of #7626

What problem does this PR solve?

Issue Number: ref #7206

What is changed and how does it work?

We can find a large number from default resource group.

{"r_u":{"settings":{"fill_rate":2147483647,"burst_limit":-1},"state":{"tokens":29860685960413220,"last_update":"2023-12-27T08:19:16.269363735Z","initialized":true}}}

So don't accumulate tokens when burstlimit less than 0

Check List

Tests

• Unit test

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• nolouch

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[codecov]

Codecov Report

Merging #7658 (9fb24c8) into release-7.5 (c9c9979) will decrease coverage by 0.09%.
Report is 3 commits behind head on release-7.5.
The diff coverage is 93.97%.

❗ Current head 9fb24c8 differs from pull request most recent head af6adbd. Consider uploading reports for the commit af6adbd to get more accurate results

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.5    #7658      +/-   ##
===============================================
- Coverage        74.74%   74.66%   -0.09%     
===============================================
  Files              443      443              
  Lines            47891    47923      +32     
===============================================
- Hits             35795    35780      -15     
- Misses            8950     8982      +32     
- Partials          3146     3161      +15     

Flag	Coverage Δ
unittests	74.66% <93.97%> (-0.09%)	⬇️

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

[CabinfeverB]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: 9fb24c8