operator: make gRPC connections synced

[YuJuncen]

What problem does this PR solve?

Issue Number: close #52049

Problem Summary:
See the issue.

What changed and how does it work?

This added a mutex for each stream.

Check List

Tests

• Unit test
  This reuses the unit test before.
  It should be transparent.
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @YuJuncen. Thanks for your PR.

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[codecov]

Codecov Report

Merging #52051 (385205f) into master (9b6db9d) will decrease coverage by 16.1203%.
Report is 69 commits behind head on master.
The diff coverage is 100.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #52051         +/-   ##
=================================================
- Coverage   70.7435%   54.6233%   -16.1203%     
=================================================
  Files          1477       1597        +120     
  Lines        438550     625577     +187027     
=================================================
+ Hits         310246     341711      +31465     
- Misses       108884     260168     +151284     
- Partials      19420      23698       +4278     

Flag	Coverage Δ
integration	36.6367% <69.2307%> (?)
unit	70.4313% <92.3076%> (-0.1117%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	50.5018% <100.0000%> (+4.6733%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, Leavrth

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Needs approval from an approver in each of these files:

• br/OWNERS [BornChanger,Leavrth]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-25 06:02:07.910455501 +0000 UTC m=+1874954.932701884: ☑️ agreed by Leavrth.
• 2024-03-25 12:32:35.844130743 +0000 UTC m=+1898382.866377129: ☑️ agreed by BornChanger.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #52081.

[BornChanger]

/lable needs-cherry-pick-release-7,1

[BornChanger]

/label needs-cherry-pick-release-7.5

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #52556.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #52557.