*: migrate stale_txn tests to real tikv tests

[ekexium]

What problem does this PR solve?

Issue Number: close #59588

Problem Summary:

See the issue.

What changed and how does it work?

1. Migrate tests from stale_txn_test.go to real tikv tests.
2. Add a new case to reproduce TSO retrieval failure during read TS validation caused by residual txn-scope code #59402

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.

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5960%. Comparing base (1596775) to head (2b3a5ff).
Report is 15 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #59589        +/-   ##
================================================
+ Coverage   73.0272%   73.5960%   +0.5687%     
================================================
  Files          1694       1694                
  Lines        468332     473016      +4684     
================================================
+ Hits         342010     348121      +6111     
+ Misses       105323     103786      -1537     
- Partials      20999      21109       +110     

Flag	Coverage Δ
integration	42.8724% <100.0000%> (?)
unit	72.4067% <100.0000%> (+0.1681%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	45.7084% <ø> (+0.4885%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-19 07:41:14.639661893 +0000 UTC m=+1033517.035883948: ☑️ agreed by zyguan.
• 2025-02-19 07:54:00.245355334 +0000 UTC m=+1034282.641577389: ☑️ agreed by cfzjywxk.