[backend] delete work when deleting task & verify that work exists in worker (#12815)

[JeremyCloarec]

Proposed changes

• now also delete associated work when deleting task
• in worker, verify that bundle work_id is still valid. If work no longer exists, ack the message without processing it

client PR: OpenCTI-Platform/client-python#983

Related issues

• Add ability to cancel the processing of tasks by the worker after the task has been provisioned #12815

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case (coverage and e2e)
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.52%. Comparing base (a2cdb90) to head (610e05a).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
...tform/opencti-graphql/src/domain/backgroundTask.js	12.50%	7 Missing ⚠️
...pencti-platform/opencti-graphql/src/domain/work.js	80.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12451      +/-   ##
==========================================
- Coverage   66.53%   66.52%   -0.01%     
==========================================
  Files         752      752              
  Lines       79741    79817      +76     
  Branches     8557     8563       +6     
==========================================
+ Hits        53056    53102      +46     
- Misses      26685    26715      +30     

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