Fix background deletion blocked

[haorenfsa]

/cc @mintcckey

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4be02a4) 80.06% compared to head (1f5c271) 80.08%.

Files	Patch %	Lines
pkg/controllers/milvus_controller.go	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
+ Coverage   80.06%   80.08%   +0.02%     
==========================================
  Files          47       47              
  Lines        4880     4881       +1     
==========================================
+ Hits         3907     3909       +2     
+ Misses        820      818       -2     
- Partials      153      154       +1     

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[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: haorenfsa, mintcckey

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