*: fix member race problem (#6070)

[ti-chi-bot]

This is an automated cherry-pick of #6070

What problem does this PR solve?

Issue Number: Ref #6069.

What is changed and how does it work?

#5310 did some changes to the header but for GetMembers, we may encounter a kind of situation: The server hasn't served but the request is coming. Because the cluster id could not be initialized, there might be a data race when reading/writing the cluster id.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• nolouch

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.05 ⚠️

Comparison is base (297cee8) 75.65% compared to head (4e12069) 75.60%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.5    #6091      +/-   ##
===============================================
- Coverage        75.65%   75.60%   -0.05%     
===============================================
  Files              330      330              
  Lines            32961    32968       +7     
===============================================
- Hits             24937    24926      -11     
- Misses            5875     5890      +15     
- Partials          2149     2152       +3     

Flag	Coverage Δ
unittests	75.60% <100.00%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
pkg/movingaverage/median_filter.go	100.00% <100.00%> (ø)
server/grpc_service.go	49.67% <100.00%> (+0.04%)	⬆️
server/server.go	75.12% <100.00%> (-0.16%)	⬇️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
server/region_syncer/server.go	81.86% <0.00%> (-4.40%)	⬇️
server/storage/storage.go	67.30% <0.00%> (-3.85%)	⬇️
pkg/etcdutil/etcdutil.go	84.88% <0.00%> (-3.49%)	⬇️
server/id/id.go	83.05% <0.00%> (-3.39%)	⬇️
server/tso/tso.go	70.78% <0.00%> (-2.25%)	⬇️
server/encryptionkm/key_manager.go	70.11% <0.00%> (-1.60%)	⬇️
... and 17 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: 4e12069