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:

• CabinfeverB
• nolouch

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[codecov]

Codecov Report

Base: 74.73% // Head: 74.73% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (d021ba2) compared to base (6555292).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.4    #4959      +/-   ##
===============================================
- Coverage        74.73%   74.73%   -0.01%     
===============================================
  Files              265      265              
  Lines            27998    28002       +4     
===============================================
+ Hits             20925    20926       +1     
- Misses            5209     5213       +4     
+ Partials          1864     1863       -1     

Flag	Coverage Δ
unittests	74.73% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	82.74% <100.00%> (-0.10%)	⬇️
server/core/basic_cluster.go	91.62% <100.00%> (+0.14%)	⬆️
server/tso/local_allocator.go	64.86% <0.00%> (-13.52%)	⬇️
server/schedulers/shuffle_hot_region.go	55.55% <0.00%> (-10.11%)	⬇️
pkg/etcdutil/etcdutil.go	82.35% <0.00%> (-5.89%)	⬇️
server/schedule/region_scatterer.go	78.36% <0.00%> (-4.09%)	⬇️
server/election/leadership.go	75.25% <0.00%> (-2.07%)	⬇️
server/core/storage.go	69.31% <0.00%> (-1.52%)	⬇️
pkg/btree/btree.go	85.78% <0.00%> (-0.97%)	⬇️
client/client.go	72.51% <0.00%> (-0.22%)	⬇️
... and 12 more

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[nolouch]

ptal @CabinfeverB

[nolouch]

/merge

[ti-chi-bot]

@nolouch: 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: 600afb6