config: disable EnableV2 of etcd

[lhy1024]

What problem does this PR solve?

Issue Number: Close #8535

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Release note

config: disable EnableV2 of etcd

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.53%. Comparing base (4b0878e) to head (fc48e50).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8536      +/-   ##
==========================================
+ Coverage   77.49%   77.53%   +0.04%     
==========================================
  Files         474      474              
  Lines       61862    61861       -1     
==========================================
+ Hits        47943    47967      +24     
+ Misses      10388    10366      -22     
+ Partials     3531     3528       -3     

Flag	Coverage Δ
unittests	77.53% <ø> (+0.04%)	⬆️

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[lhy1024]

/test pull-integration-realcluster-test

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-16 04:25:00.051698165 +0000 UTC m=+501184.755167793: ☑️ agreed by nolouch.
• 2024-08-16 06:27:31.821165325 +0000 UTC m=+508536.524634968: ☑️ agreed by rleungx.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: niubell, nolouch, rleungx

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• OWNERS [nolouch,rleungx]
• server/config/OWNERS [niubell]

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