config: sync store config in time (#6919)

[ti-chi-bot]

This is an automated cherry-pick of #6919

What problem does this PR solve?

Issue Number: Close #6918

What is changed and how does it work?

add timeout context for observer tikv config to avoid wait too long

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

sync store config in time

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• rleungx

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[codecov]

Codecov Report

Patch coverage: 82.35% and project coverage change: +0.07% 🎉

Comparison is base (3a19dec) 75.59% compared to head (90d4386) 75.67%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.5    #6932      +/-   ##
===============================================
+ Coverage        75.59%   75.67%   +0.07%     
===============================================
  Files              328      328              
  Lines            33199    33211      +12     
===============================================
+ Hits             25097    25131      +34     
+ Misses            5947     5927      -20     
+ Partials          2155     2153       -2     

Flag	Coverage Δ
unittests	75.67% <82.35%> (+0.07%)	⬆️

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

Files Changed	Coverage Δ
server/config/store_config.go	80.43% <71.42%> (-1.18%)	⬇️
server/cluster/cluster.go	81.50% <90.00%> (-0.06%)	⬇️

... and 23 files with indirect coverage changes

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[bufferflies]

/merge

[ti-chi-bot]

@bufferflies: 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: 90d4386