Disable cluster failover by default which should be explicitly enabled by administrators after a fully evaluation

[XiShanYongYe-Chang]

Cherry pick of #5899 on release-1.10.
For details on the cherry pick process, see the cherry pick requests page.

The feature `Failover` now has been disabled by default, which should be explicitly enabled to avoid unexpected incidents. 

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.18%. Comparing base (db098b7) to head (65b1ce3).

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Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.10    #5947      +/-   ##
================================================
- Coverage         51.50%   51.18%   -0.32%     
================================================
  Files               260      263       +3     
  Lines             25795    26455     +660     
================================================
+ Hits              13285    13542     +257     
- Misses            11774    12137     +363     
- Partials            736      776      +40     

Flag	Coverage Δ
unittests	51.18% <ø> (-0.32%)	⬇️

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[RainbowMango]

/lgtm
/approve

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