feat(api): allow turning off node evacuations for rolling updates

[keynslug]

Summary

This PR refines EQMX CRD specification by allowing more control over node evacuations (as part of rolling updates).

1. Node evacuations can now be disabled.
2. Introduces type field to make EvacuationStrategy more conventional and extensible.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.08%. Comparing base (80a8691) to head (404d692).
⚠️ Report is 6 commits behind head on main-3.x.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-3.x    #1186      +/-   ##
============================================
+ Coverage     76.07%   76.08%   +0.01%     
============================================
  Files            48       48              
  Lines          3996     3998       +2     
============================================
+ Hits           3040     3042       +2     
  Misses          799      799              
  Partials        157      157              

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