Add deletecollection verb.

[runakash]

Issue #, if available: Fixes #225

Description of changes: Add deletecollection verb. To fix the error encountered with k8s DeleteAllOf operation on endpointslices.discovery.k8s.io.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.47%. Comparing base (4dc8b4d) to head (02e7184).
Report is 161 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   71.47%   71.47%           
=======================================
  Files          17       17           
  Lines        1697     1697           
=======================================
  Hits         1213     1213           
  Misses        406      406           
  Partials       78       78           

Files with missing lines	Coverage Δ
...kg/controllers/multicluster/cloudmap_controller.go	52.86% <ø> (ø)

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