Feat: add func for clear ns

[Somefive]

Signed-off-by: Yin Da yd219913@alibaba-inc.com

[codecov]

Codecov Report

Base: 90.90% // Head: 91.27% // Increases project coverage by +0.36% 🎉

Coverage data is based on head (24aba7d) compared to base (302624c).
Patch coverage: 91.36% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   90.90%   91.27%   +0.36%     
==========================================
  Files          15       35      +20     
  Lines         352      688     +336     
==========================================
+ Hits          320      628     +308     
- Misses         19       42      +23     
- Partials       13       18       +5     

Flag	Coverage Δ
unit-test	91.27% <91.36%> (+0.36%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
util/k8s/object.go	96.36% <ø> (ø)
util/k8s/namespace.go	55.55% <55.55%> (ø)
util/compression/gzip.go	60.00% <60.00%> (ø)
multicluster/client.go	83.67% <75.00%> (+1.06%)	⬆️
util/singleton/client.go	78.94% <78.94%> (ø)
util/compression/data.go	80.00% <80.00%> (ø)
controller/client/timeout_client.go	92.85% <92.85%> (ø)
controller/client/controller_client.go	80.64% <100.00%> (+0.64%)	⬆️
controller/client/flags.go	100.00% <100.00%> (ø)
controller/client/monitor_client.go	100.00% <100.00%> (ø)
... and 17 more

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