*: (8.1) 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.1@5ac7f18). Learn more about missing BASE report.

❗ Current head 836beeb differs from pull request most recent head 2ac5b3d

Please upload reports for the commit 2ac5b3d to get more accurate results.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #59521   +/-   ##
================================================
  Coverage               ?   71.2102%           
================================================
  Files                  ?       1468           
  Lines                  ?     424019           
  Branches               ?          0           
================================================
  Hits                   ?     301945           
  Misses                 ?     101526           
  Partials               ?      20548           

Flag	Coverage Δ
unit	71.2102% <ø> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.4273% <0.0000%> (?)

[ekexium]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [MyonKeminta,cfzjywxk]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-17 08:07:47.27851265 +0000 UTC m=+862309.674734713: ☑️ agreed by MyonKeminta.
• 2025-02-19 07:50:15.260993429 +0000 UTC m=+1034057.657215491: ☑️ agreed by cfzjywxk.

[ekexium]

/retest

[ti-chi-bot]

@ekexium: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	2ac5b3d	link	true	/test unit-test
idc-jenkins-ci-tidb/build	2ac5b3d	link	true	/test build
idc-jenkins-ci-tidb/check_dev	2ac5b3d	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	2ac5b3d	link	true	/test check-dev2

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.