No need to fire useless delete requests when slice is still in stage dir

[polyrabbit]

Avoid slow and expensive object deletion if the block is still in staging

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 24.94%. Comparing base (fbe92e3) to head (7312dcd). Report is 79 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4922       +/-   ##
===========================================
- Coverage   44.35%   24.94%   -19.41%     
===========================================
  Files         102       25       -77     
  Lines       19032    16045     -2987     
===========================================
- Hits         8442     4003     -4439     
- Misses       9815    11552     +1737     
+ Partials      775      490      -285     

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