*: fix scheduling can not immediately start after transfer leader (#4875)

[ti-chi-bot]

This is an automated cherry-pick of #4875

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

What problem does this PR solve?

Issue Number: Close #4769.

What is changed and how does it work?

This PR uses the flag to distinguish if the region's heartbeat is new when transferring the PD leader.

Check List

Tests

• Unit test

Release note

Fix the issue that scheduling cannot immediately start after PD leader transfers

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[codecov]

Codecov Report

Merging #4969 (b52b8c5) into release-5.3 (2ebb589) will decrease coverage by 0.09%.
The diff coverage is 88.00%.

@@               Coverage Diff               @@
##           release-5.3    #4969      +/-   ##
===============================================
- Coverage        74.89%   74.80%   -0.10%     
===============================================
  Files              263      263              
  Lines            27341    27354      +13     
===============================================
- Hits             20478    20461      -17     
- Misses            5046     5069      +23     
- Partials          1817     1824       +7     

Flag	Coverage Δ
unittests	74.80% <88.00%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
server/region_syncer/client.go	79.06% <50.00%> (-0.62%)	⬇️
server/cluster/cluster.go	82.67% <85.71%> (+0.21%)	⬆️
server/cluster/coordinator.go	74.78% <100.00%> (+0.52%)	⬆️
server/core/region.go	91.87% <100.00%> (+0.04%)	⬆️
server/core/region_option.go	82.85% <100.00%> (+0.33%)	⬆️
server/grpc_service.go	51.01% <100.00%> (+0.60%)	⬆️
pkg/errs/errs.go	75.00% <0.00%> (-25.00%)	⬇️
server/schedulers/shuffle_hot_region.go	55.55% <0.00%> (-10.11%)	⬇️
server/tso/local_allocator.go	64.86% <0.00%> (-6.76%)	⬇️
pkg/etcdutil/etcdutil.go	82.35% <0.00%> (-5.89%)	⬇️
... and 16 more

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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: ca6635b

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@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.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

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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