topsql: set RPC interceptor immediately after a txn is activated (#51795)

[ti-chi-bot]

This is an automated cherry-pick of #51795

What problem does this PR solve?

Issue Number: close #52845

Problem Summary:

This is to fix the resource group tag problem found in testing of pipelined-dml. The tagger was nil for Flush requests.

What changed and how does it work?

Set resource group tagger immediately after a txn is activated so that the following Flush requests can use it.

Check List

Tests

• Unit test: existing topsql tests are not broken.
• Integration test
• Manual test (add detailed scripts or steps below)
  Enable P-DML for all UTs, those that failed because of lack of resource group tag now pass.
• 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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ekexium]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-8.1@6987f58). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #52881   +/-   ##
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  Coverage               ?   72.2213%           
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  Files                  ?       1464           
  Lines                  ?     427954           
  Branches               ?          0           
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  Hits                   ?     309074           
  Misses                 ?      98709           
  Partials               ?      20171           

Flag	Coverage Δ
unit	72.2213% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9957% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	40.9752% <0.0000%> (?)

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-04-28 02:28:23.176037982 +0000 UTC m=+151456.933173554: ☑️ agreed by crazycs520.
• 2024-04-29 07:31:43.954621353 +0000 UTC m=+256057.711756928: ☑️ agreed by MyonKeminta.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crazycs520, MyonKeminta

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• OWNERS [MyonKeminta,crazycs520]

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[ekexium]

/retest