[draft] 8.5: add etcd key compatibility test

[okJiang]

What problem does this PR solve?

Issue Number: Close #xxx

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[purelind]

/test ？

[ti-chi-bot]

@purelind: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

/test build

/test integration-copr-test

Use /test all to run the following jobs that were automatically triggered:

tikv/pd/release-8.5/ghpr_build

In response to this:

/test ？

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[purelind]

/test build

[okJiang]

/retest

[okJiang]

/retest

[codecov]

Codecov Report

Attention: Patch coverage is 84.78261% with 7 lines in your changes missing coverage. Please review.

Project coverage is 75.59%. Comparing base (2da8160) to head (2deab4c).

Additional details and impacted files

@@               Coverage Diff               @@
##           release-8.5    #9125      +/-   ##
===============================================
+ Coverage        75.58%   75.59%   +0.01%     
===============================================
  Files              462      462              
  Lines            72389    72429      +40     
===============================================
+ Hits             54715    54753      +38     
+ Misses           14176    14166      -10     
- Partials          3498     3510      +12     

Flag	Coverage Δ
unittests	75.59% <84.78%> (+0.01%)	⬆️

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[okJiang]

/retest

[okJiang]

/retest