schedule: when Region is removed from RegionsInfo, also remove fit cache

[HunDunDM]

Signed-off-by: HunDunDM hundundm@gmail.com

What problem does this PR solve?

Issue Number: Ref #5864

When a Region is deleted from RegionsInfo for reasons such as Merge, its FitCache will remain in memory forever, resulting in a memory leak.

What is changed and how does it work?

part of #5860

Remove the Fit Cache when removing the overlaps region.

Check List

Tests

• Unit test

Release note

None

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• CabinfeverB
• lhy1024

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[codecov]

Codecov Report

Base: 75.55% // Head: 75.55% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (94a0daa) compared to base (c5bf5be).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 94a0daa differs from pull request most recent head 33be395. Consider uploading reports for the commit 33be395 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #5865    +/-   ##
========================================
  Coverage   75.55%   75.55%            
========================================
  Files         341      337     -4     
  Lines       34404    34155   -249     
========================================
- Hits        25993    25805   -188     
+ Misses       6178     6127    -51     
+ Partials     2233     2223    -10     

Flag	Coverage Δ
unittests	75.55% <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	81.76% <100.00%> (-0.50%)	⬇️
server/schedule/placement/rule_manager.go	85.20% <100.00%> (+0.89%)	⬆️
pkg/mcs/resource_manager/server/grpc_service.go	73.91% <0.00%> (-5.82%)	⬇️
server/tso/tso.go	68.53% <0.00%> (-5.62%)	⬇️
pkg/member/member.go	62.10% <0.00%> (-3.69%)	⬇️
pkg/utils/etcdutil/etcdutil.go	84.88% <0.00%> (-3.49%)	⬇️
pkg/id/id.go	83.05% <0.00%> (-3.39%)	⬇️
client/client.go	67.59% <0.00%> (-3.20%)	⬇️
pkg/storage/kv/etcd_kv.go	72.22% <0.00%> (-3.18%)	⬇️
server/schedulers/transfer_witness_leader.go	78.26% <0.00%> (-3.14%)	⬇️
... and 36 more

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[HunDunDM]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: 33be395