Feat: filter out OCM ManagedCluster underlying secret

[Somefive]

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

[codecov]

Codecov Report

Merging #17 (15fe69a) into master (27c9883) will decrease coverage by 0.09%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   80.68%   80.59%   -0.10%     
==========================================
  Files          12       12              
  Lines         233      237       +4     
==========================================
+ Hits          188      191       +3     
- Misses         33       34       +1     
  Partials       12       12              

Flag	Coverage Δ
unit-test	80.59% <85.71%> (-0.10%)	⬇️

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Impacted Files	Coverage Δ
pkg/apis/cluster/v1alpha1/errors.go	62.50% <75.00%> (-4.17%)	⬇️
pkg/apis/cluster/v1alpha1/reader.go	100.00% <100.00%> (ø)

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