Remove some HealthInterval to reduce the time to run DowngradeUpgradeMembers

[siyuanfoundation]

Part of #19306.

This would reduce the time to run DowngradeUpgradeMembers. But it still would not complete in 1min (still needs about 90s with this change for downgrading and upgrading all 3 members).

@gangli113 is working on changing the failpoint timeout for the MemberDowngradeUpgrade failpoint.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[k8s-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.83%. Comparing base (b197332) to head (6b0a9cd).
Report is 4 commits behind head on main.

Additional details and impacted files

see 18 files with indirect coverage changes

@@           Coverage Diff           @@
##             main   #19317   +/-   ##
=======================================
  Coverage   68.83%   68.83%           
=======================================
  Files         420      420           
  Lines       35701    35701           
=======================================
  Hits        24574    24574           
- Misses       9701     9706    +5     
+ Partials     1426     1421    -5     

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[ahrtr]

LGTM

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, serathius, siyuanfoundation

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