server, allocator_manager: close grpc conn when close server

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #7782, tested by #7777

What is changed and how does it work?

server: close grpc conn when close server

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Merging #7786 (4c168a0) into master (cce1464) will decrease coverage by 0.02%.
Report is 1 commits behind head on master.
The diff coverage is 60.00%.

❗ Current head 4c168a0 differs from pull request most recent head 744d641. Consider uploading reports for the commit 744d641 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7786      +/-   ##
==========================================
- Coverage   73.45%   73.44%   -0.02%     
==========================================
  Files         432      432              
  Lines       47843    47858      +15     
==========================================
+ Hits        35145    35151       +6     
- Misses       9654     9675      +21     
+ Partials     3044     3032      -12     

Flag	Coverage Δ
unittests	73.44% <60.00%> (-0.02%)	⬇️

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

[JmPotato]

/merge

[ti-chi-bot]

@JmPotato: 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: 4c168a0

[ti-chi-bot]

@HuSharp: Your PR was out of date, I have automatically updated it for you.

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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