resource_control: fix consumption less zero (#6983)

[ti-chi-bot]

This is an automated cherry-pick of #6983

What problem does this PR solve?

Issue Number: Close #6973

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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[codecov]

Codecov Report

Patch coverage is 100.00% of modified lines.

Files Changed	Coverage
client/resource_group/controller/controller.go	100.00%
client/resource_group/controller/model.go	100.00%
pkg/mcs/resource_manager/server/manager.go	100.00%

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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: 5bade3c