Feat: support cluster control plane label

[Somefive]

Signed-off-by: Yin Da [email protected]

Support cluster.core.oam.dev/control-plane label for all clusters. This label is added in logic label, but can be seen and selected.

[codecov]

Codecov Report

Base: 83.07% // Head: 83.31% // Increases project coverage by +0.23% 🎉

Coverage data is based on head (0b780bc) compared to base (c3c6d99).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
+ Coverage   83.07%   83.31%   +0.23%     
==========================================
  Files          32       32              
  Lines         721      725       +4     
==========================================
+ Hits          599      604       +5     
+ Misses         85       84       -1     
  Partials       37       37              

Flag	Coverage Δ
unit-test	83.31% <100.00%> (+0.23%)	⬆️

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

Impacted Files	Coverage Δ
pkg/apis/cluster/v1alpha1/config.go	0.00% <ø> (ø)
pkg/apis/cluster/v1alpha1/client.go	79.68% <100.00%> (+1.35%)	⬆️
pkg/apis/cluster/v1alpha1/reader.go	100.00% <100.00%> (ø)
pkg/util/singleton/client.go	23.07% <0.00%> (+1.64%)	⬆️

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