Worker fixes for deletion

[nellh]

Fixes #3128. Runs S3 file cleanup in a process but otherwise waits for deletion to be finished before returning success.

Couple minor fixes included:

• Fixes the redirect after deletion to correctly return to search.
• Avoids eating errors in during deletion and logs them now.
• 404 if the request is made on a dataset which as already been deleted but not otherwise.

[codecov]

Codecov Report

Attention: Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.

Project coverage is 43.10%. Comparing base (b33cd43) to head (021b19d).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...rvices/datalad/datalad_service/handlers/dataset.py	50.00%	3 Missing ⚠️
services/datalad/datalad_service/tasks/publish.py	57.14%	3 Missing ⚠️
...neuro-app/src/scripts/datalad/mutations/delete.jsx	0.00%	1 Missing ⚠️
...neuro-app/src/scripts/dataset/mutations/delete.jsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3130      +/-   ##
==========================================
+ Coverage   43.08%   43.10%   +0.02%     
==========================================
  Files         596      596              
  Lines       37849    37840       -9     
  Branches     1095     1095              
==========================================
+ Hits        16307    16311       +4     
+ Misses      21335    21322      -13     
  Partials      207      207              

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