*: (7.5) 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-7.5@eaf7090). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #59523   +/-   ##
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  Coverage               ?   72.1582%           
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  Files                  ?       1417           
  Lines                  ?     413616           
  Branches               ?          0           
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  Hits                   ?     298458           
  Misses                 ?      95152           
  Partials               ?      20006           

Flag	Coverage Δ
unit	72.1582% <ø> (?)

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Components	Coverage Δ
dumpling	52.9400% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.4561% <0.0000%> (?)

[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 08:02:39.546922229 +0000 UTC m=+862001.943144285: ☑️ agreed by MyonKeminta.
• 2025-02-19 07:50:45.643968249 +0000 UTC m=+1034088.040190310: ☑️ agreed by cfzjywxk.