mcs/resourcemanager: delete expire tokenSlot (#7344)

[ti-chi-bot]

This is an automated cherry-pick of #7344

What problem does this PR solve?

If tidb/tiflash crash unexpectly or killed by signal which cannot be handled, there will be a useless slot, which will cause fillrate/burstlimit become less than expected for other alive ones.
So add a expire timeout(10min).

Issue Number: Close #7346

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• HuSharp

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[CabinfeverB]

/merge

[ti-chi-bot]

@CabinfeverB: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: ae13138

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (b54ac93) 74.88% compared to head (4a0c30d) 74.81%.

Files	Patch %	Lines
pkg/mcs/resource_manager/server/token_bukets.go	63.63%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.1    #7349      +/-   ##
===============================================
- Coverage        74.88%   74.81%   -0.07%     
===============================================
  Files              410      410              
  Lines            41534    41544      +10     
===============================================
- Hits             31104    31083      -21     
- Misses            7704     7717      +13     
- Partials          2726     2744      +18     

Flag	Coverage Δ
unittests	74.81% <63.63%> (-0.07%)	⬇️

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