chore: fix delete backup hang

[wangyelei]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.95%. Comparing base (c59de8c) to head (1a435bf).
Report is 48 commits behind head on release-0.9.

Files with missing lines	Patch %	Lines
pkg/dataprotection/backup/deleter.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #8321      +/-   ##
===============================================
- Coverage        65.20%   64.95%   -0.26%     
===============================================
  Files              356      358       +2     
  Lines            44731    45308     +577     
===============================================
+ Hits             29169    29429     +260     
- Misses           12979    13274     +295     
- Partials          2583     2605      +22     

Flag	Coverage Δ
unittests	64.95% <50.00%> (-0.26%)	⬇️

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