[Backport 2.17] Optimise snapshot deletion to speed up snapshot deletion and creation(#15568)

[ashking94]

Backport 3fc0139 from #15568

[github-actions]

✅ Gradle check result for 19887cf: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 82.14286% with 10 lines in your changes missing coverage. Please review.

Project coverage is 71.70%. Comparing base (3d0846e) to head (19887cf).
Report is 7 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
...ch/repositories/blobstore/BlobStoreRepository.java	80.76%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15725      +/-   ##
============================================
+ Coverage     71.65%   71.70%   +0.04%     
- Complexity    64304    64440     +136     
============================================
  Files          5262     5262              
  Lines        301051   301095      +44     
  Branches      43826    43830       +4     
============================================
+ Hits         215726   215900     +174     
+ Misses        67218    67174      -44     
+ Partials      18107    18021      -86     

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