cluster: reset stores cache before loading cluster info (#4942)

[ti-chi-bot]

This is an automated cherry-pick of #4942

Signed-off-by: Ryan Leung [email protected]

What problem does this PR solve?

Issue Number: Close #4941.

What is changed and how does it work?

This PR resets the new leader store cache after transferring the PD leader.

Check List

Tests

• Unit test

Release note

Fix the issue that the removed tombstone store shows again after transferring the PD leader

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Merging #4958 (7ab45ee) into release-5.3 (b73b12d) will increase coverage by 0.15%.
The diff coverage is 80.00%.

@@               Coverage Diff               @@
##           release-5.3    #4958      +/-   ##
===============================================
+ Coverage        74.92%   75.07%   +0.15%     
===============================================
  Files              263      263              
  Lines            27330    27334       +4     
===============================================
+ Hits             20478    20522      +44     
+ Misses            5036     5008      -28     
+ Partials          1816     1804      -12     

Flag	Coverage Δ
unittests	75.07% <80.00%> (+0.15%)	⬆️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	82.69% <50.00%> (+0.25%)	⬆️
server/core/basic_cluster.go	91.62% <100.00%> (+0.14%)	⬆️
pkg/dashboard/adapter/manager.go	77.65% <0.00%> (-5.32%)	⬇️
server/core/hot_region_storage.go	77.33% <0.00%> (-1.34%)	⬇️
pkg/btree/btree.go	85.78% <0.00%> (-0.97%)	⬇️
server/member/member.go	64.70% <0.00%> (-0.54%)	⬇️
server/server.go	72.00% <0.00%> (-0.45%)	⬇️
server/id/id.go	80.95% <0.00%> (ø)
server/grpc_service.go	50.91% <0.00%> (ø)
... and 9 more

---

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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: 7ab45ee