test: add etcd key compatibility test

[okJiang]

What problem does this PR solve?

Issue Number: Ref #9127

What is changed and how does it work?

This PR introduces a new etcd key compatibility test, with its test data based on release 8.5. It is only for reviewing the code of this test, so I have not enabled it. In the next PR, I will fix the changes to the etcd keys from release 8.5 to master and provide source explanations for those changes.

Code Overview: I used failpoint to collect the operation of keys during the test and saved the results to a file. If the results from the new code do not match those in the file, it indicates that the operations on the keys have changed during testing. This compels us to pay attention to changes in the keys.

Check List

Tests

• Unit test
• Integration test

Please refer to the test results here; they are based on test data generated from the release-8.5 code.

Release note

None.

[ti-chi-bot]

Skipping CI for Draft Pull Request.
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[ti-chi-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 81.08108% with 7 lines in your changes missing coverage. Please review.

Project coverage is 76.34%. Comparing base (bdd857e) to head (84da7fc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9126      +/-   ##
==========================================
+ Coverage   76.31%   76.34%   +0.03%     
==========================================
  Files         473      473              
  Lines       71975    72012      +37     
==========================================
+ Hits        54926    54976      +50     
+ Misses      13612    13604       -8     
+ Partials     3437     3432       -5     

Flag	Coverage Δ
unittests	76.34% <81.08%> (+0.03%)	⬆️

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[okJiang]

/retest

[okJiang]

/retest