[feat] add support for deleting reserved IPv4 addresses in NodeBalancer deletion

[moshevayner]

Default behavior is still to retain the reserved IP, just to maintain backwards compatibility

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• Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

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2. Have you added tests?
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.76%. Comparing base (512ca7e) to head (b15eb93).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #589      +/-   ##
==========================================
+ Coverage   73.68%   73.76%   +0.07%     
==========================================
  Files          19       19              
  Lines        3036     3045       +9     
==========================================
+ Hits         2237     2246       +9     
  Misses        538      538              
  Partials      261      261              

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