etcdutil: remove stale client endpoints for healthyChecker (#7227)

[ti-chi-bot]

This is an automated cherry-pick of #7227

Signed-off-by: iosmanthus myosmanthustree@gmail.com

What problem does this PR solve?

Issue Number: Close #7226

What has changed and how does it work?

Remove the stale client endpoints in the healthyChecker.update for every 10s.

remove stale client endpoints for `healthyChecker`

has been cp by #7793

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• rleungx

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[codecov]

Codecov Report

Merging #7387 (b57985f) into release-7.5 (d0a17ca) will decrease coverage by 0.01%.
Report is 15 commits behind head on release-7.5.
The diff coverage is 85.00%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-7.5    #7387      +/-   ##
===============================================
- Coverage        74.61%   74.61%   -0.01%     
===============================================
  Files              442      442              
  Lines            47822    47834      +12     
===============================================
+ Hits             35682    35690       +8     
- Misses            8985     8986       +1     
- Partials          3155     3158       +3     

Flag	Coverage Δ
unittests	74.61% <85.00%> (-0.01%)	⬇️

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[ti-chi-bot]

PR needs rebase.

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[HuSharp]

cp by #7793