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

[ti-chi-bot]

This is an automated cherry-pick of #5310

Signed-off-by: husharp jinhao.hu@pingcap.com

What problem does this PR solve?

Issue Number: Ref #5309. Close #5161

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]

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