*: (7.1) fix TSO retrieval failure during read TS validation

[ekexium]

What problem does this PR solve?

Issue Number: ref #59402

Problem Summary:

What changed and how does it work?

Do not set txn scope in snapshot to fix the problem.

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

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

Fix TSO retrieval failure during read TS validation when `zone` label is set.

[ekexium]

/retest

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.1@6921c31). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.1     #59525   +/-   ##
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  Misses                 ?      83424           
  Partials               ?      17927           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-17 08:02:01.596721806 +0000 UTC m=+861963.992943868: ☑️ agreed by MyonKeminta.
• 2025-02-19 07:51:26.266978213 +0000 UTC m=+1034128.663200272: ☑️ agreed by cfzjywxk.