robustness: implement cluster client endpoint switching

[henrybear327]

Introduce optional cluster client endpoint switching.

This would allow us to test out the client reconnection behaviors, such as the resumable guarantee for watches.

Used in #21472

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.43%. Comparing base (feea852) to head (62787b8).

⚠️ Current head 62787b8 differs from pull request most recent head 5153092

Please upload reports for the commit 5153092 to get more accurate results.

Additional details and impacted files

see 47 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21471      +/-   ##
==========================================
- Coverage   68.48%   68.43%   -0.05%     
==========================================
  Files         432      428       -4     
  Lines       35414    35291     -123     
==========================================
- Hits        24253    24152     -101     
+ Misses       9758     9738      -20     
+ Partials     1403     1401       -2     

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[henrybear327]

/retest

[henrybear327]

/retest

[serathius]

Can you describe the solution, how it works, what purpose it serve, what are alternatives?