*: put gRPC unknown error into the header. (#5310)

[nolouch]

Issue Number: Ref #5309. Close #5161 pingcap/tiflash#7408
pick #5310

What is changed and how does it work?

put the unknown error into the header instead of directly returning a gRPC error.

Check List

Tests

• Unit test

Release note

Put the unknown error into the header instead of directly returning a gRPC error.
And modify related uint tests and code.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• HuSharp
• lhy1024

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[nolouch]

ref pingcap/tiflash#7408

[codecov]

Codecov Report

Patch coverage: 25.56% and project coverage change: -0.25 ⚠️

Comparison is base (0be684b) 75.70% compared to head (886f415) 75.46%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.1    #6724      +/-   ##
===============================================
- Coverage        75.70%   75.46%   -0.25%     
===============================================
  Files              307      307              
  Lines            30506    30567      +61     
===============================================
- Hits             23094    23066      -28     
- Misses            5432     5498      +66     
- Partials          1980     2003      +23     

Flag	Coverage Δ
unittests	75.46% <25.56%> (-0.25%)	⬇️

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

Impacted Files	Coverage Δ
server/api/member.go	52.38% <0.00%> (-0.85%)	⬇️
server/tso/global_allocator.go	61.45% <0.00%> (-1.31%)	⬇️
server/grpc_service.go	50.45% <19.31%> (-1.21%)	⬇️
tests/cluster.go	79.33% <25.00%> (-1.08%)	⬇️
client/client.go	69.33% <38.46%> (+1.00%)	⬆️
client/base_client.go	80.71% <100.00%> (+0.29%)	⬆️
server/tso/allocator_manager.go	63.69% <100.00%> (-2.20%)	⬇️

... and 18 files with indirect coverage changes

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[nolouch]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 886f415

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This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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