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 rleungx@gmail.com

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:

• nolouch
• rleungx

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[codecov]

Codecov Report

Base: 74.93% // Head: 74.74% // Decreases project coverage by -0.19% ⚠️

Coverage data is based on head (be2efa8) compared to base (8c4c7a9).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-5.2    #4957      +/-   ##
===============================================
- Coverage        74.93%   74.74%   -0.20%     
===============================================
  Files              249      249              
  Lines            25761    25765       +4     
===============================================
- Hits             19304    19257      -47     
- Misses            4768     4802      +34     
- Partials          1689     1706      +17     

Flag	Coverage Δ
unittests	74.74% <80.00%> (-0.20%)	⬇️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	82.01% <50.00%> (-0.10%)	⬇️
server/core/basic_cluster.go	91.42% <100.00%> (+0.14%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
server/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
server/tso/tso.go	64.48% <0.00%> (-6.02%)	⬇️
server/region_syncer/server.go	84.44% <0.00%> (-5.93%)	⬇️
pkg/dashboard/adapter/manager.go	78.72% <0.00%> (-4.26%)	⬇️
server/schedule/region_scatterer.go	78.99% <0.00%> (-4.21%)	⬇️
server/member/member.go	63.10% <0.00%> (-3.75%)	⬇️
server/election/leadership.go	83.90% <0.00%> (-3.45%)	⬇️
... and 11 more

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[nolouch]

/merge

[ti-chi-bot]

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[ti-chi-bot]

@nolouch: /merge in this pull request requires 2 approval(s).

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/merge

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[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: 5becbd0

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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