add imagepulljob featuregate

[zmberg]

Ⅰ. Describe what this PR does

Add featuregate for ImagePullJob.

[sonatype-lift]

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[codecov-commenter]

Codecov Report

Merging #1357 (22b6068) into master (a44ca54) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##           master    #1357      +/-   ##
==========================================
- Coverage   48.57%   48.57%   -0.01%     
==========================================
  Files         152      152              
  Lines       21333    21334       +1     
==========================================
  Hits        10363    10363              
- Misses       9832     9833       +1     
  Partials     1138     1138              

Flag	Coverage Δ
unittests	48.57% <0.00%> (-0.01%)	⬇️

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

Files Changed	Coverage Δ
...er/imagelistpulljob/imagelistpulljob_controller.go	61.06% <0.00%> (-0.24%)	⬇️

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[veophi]

/lgtm

[zmberg]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zmberg

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