chore: support to delete failed backups when deleting cluster

[wangyelei]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 61.35%. Comparing base (0d4a0b5) to head (307c463).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
controllers/apps/transform_utils.go	43.75%	8 Missing and 1 partial ⚠️
controllers/apps/transformer_cluster_deletion.go	44.44%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8435      +/-   ##
==========================================
+ Coverage   61.12%   61.35%   +0.22%     
==========================================
  Files         351      351              
  Lines       41743    41764      +21     
==========================================
+ Hits        25517    25623     +106     
+ Misses      13927    13828      -99     
- Partials     2299     2313      +14     

Flag	Coverage Δ
unittests	61.35% <50.00%> (+0.22%)	⬆️

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