feat: add component label for subscription

[Abirdcfly]

What type of PR is this?

/kind feature

What this PR does / why we need it

For quick search

Which issue(s) this PR fixes

Fixes #

Special notes for your reviewer

[codecov[bot]]

Codecov Report

Merging #375 (c05d93b) into main (798efeb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #375   +/-   ##
=======================================
  Coverage   27.61%   27.61%           
=======================================
  Files          37       37           
  Lines        4468     4468           
=======================================
  Hits         1234     1234           
  Misses       3130     3130           
  Partials      104      104           

Files	Coverage Δ
api/v1alpha1/subscription.go	89.85% <ø> (ø)

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