*: fix issue of tikv rpc request source tag unset

[crazycs520]

What problem does this PR solve?

Issue Number: close #47753

related pr: tikv/client-go#1026

Problem Summary: fix issue of tikv rpc request source tag unset

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

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None

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MyonKeminta, zyguan

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-18 09:55:43.965446311 +0000 UTC m=+1823741.552556457: ☑️ agreed by MyonKeminta.
• 2023-10-18 09:56:07.929500455 +0000 UTC m=+1823765.516610617: ☑️ agreed by zyguan.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.1@536545d). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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