storelimit: fix datarace from getOrCreateStoreLimit (#8254)

[ti-chi-bot]

This is an automated cherry-pick of #8254

What problem does this PR solve?

Issue Number: Close #8253

What is changed and how does it work?

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

go test -timeout 120s -run ^TestConcurrentAddOperatorAndSetStoreLimit$ github.com/tikv/pd/pkg/schedule/operator -race

• run test TestConcurrentAddOperatorAndSetStoreLimit on master

WARNING: DATA RACE
Write at 0x00c0005ae480 by goroutine 220:
  github.com/tikv/pd/pkg/core/storelimit.(*limit).Reset()
      /home/lhy1024/pd/pkg/core/storelimit/store_limit.go:151 +0x227
  github.com/tikv/pd/pkg/core/storelimit.(*StoreRateLimit).Reset()
      /home/lhy1024/pd/pkg/core/storelimit/store_limit.go:126 +0x3b
  github.com/tikv/pd/pkg/core.(*StoresInfo).ResetStoreLimit.ResetStoreLimit.func1()
      /home/lhy1024/pd/pkg/core/store_option.go:258 +0x14b
  github.com/tikv/pd/pkg/core.(*StoreInfo).Clone()
      /home/lhy1024/pd/pkg/core/store.go:112 +0x17a
  github.com/tikv/pd/pkg/core.(*StoresInfo).ResetStoreLimit()
      /home/lhy1024/pd/pkg/core/store.go:870 +0x208
  github.com/tikv/pd/pkg/schedule/operator.(*Controller).getOrCreateStoreLimit()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller.go:989 +0x2b7
  github.com/tikv/pd/pkg/schedule/operator.(*Controller).ExceedStoreLimit()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller.go:966 +0x464
  github.com/tikv/pd/pkg/schedule/operator.(*Controller).AddOperator()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller.go:355 +0x6b
  github.com/tikv/pd/pkg/schedule/operator.TestConcurrentAddOperatorAndSetStoreLimit.func1()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller_test.go:987 +0x2fb
  github.com/tikv/pd/pkg/schedule/operator.TestConcurrentAddOperatorAndSetStoreLimit.gowrap1()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller_test.go:994 +0x41

Previous read at 0x00c0005ae480 by goroutine 221:
  github.com/tikv/pd/pkg/core/storelimit.(*limit).Available()
      /home/lhy1024/pd/pkg/core/storelimit/store_limit.go:162 +0xb2
  github.com/tikv/pd/pkg/core/storelimit.(*StoreRateLimit).Available()
      /home/lhy1024/pd/pkg/core/storelimit/store_limit.go:101 +0x3a
  github.com/tikv/pd/pkg/schedule/operator.(*Controller).ExceedStoreLimit()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller.go:970 +0x4e5
  github.com/tikv/pd/pkg/schedule/operator.(*Controller).AddOperator()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller.go:355 +0x6b
  github.com/tikv/pd/pkg/schedule/operator.TestConcurrentAddOperatorAndSetStoreLimit.func1()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller_test.go:987 +0x2fb
  github.com/tikv/pd/pkg/schedule/operator.TestConcurrentAddOperatorAndSetStoreLimit.gowrap1()
      /home/lhy1024/pd/pkg/schedule/operator/operator_controller_test.go:994 +0x41

• run test TestConcurrentAddOperatorAndSetStoreLimit with this PR

ok  	github.com/tikv/pd/pkg/schedule/operator	1.473s

Release note

None.

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[nolouch]

/merge

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

Commit hash: 4bb12de