chore(cellguide): Add slack notification to pipeline and skip if DOI returns 404

[kaloster]

Reason for Change

• chore: add error notification to slack for cellguide pipeline to match wmg pipeline #7358
• Pipeline fails on bad DOI requests to crossref provider

Changes

• Added slack notification to pipeline in case of success/fail
• Revised _fetch_crossref_payload to return None in case of 404 instead of raising
• Updated relevant unit test

Testing steps

• Unit tests
• Run pipeline in staging

---

TODO: address "doesn't create a collection with an invalid DOI" logged in test that is now failing as result of not raising on bad DOI

[github-actions]

Deployment Summary

• backend_url: https://pr-7359-backend.rdev.single-cell.czi.technology
• backend_de_url: https://pr-7359-backend-de.rdev.single-cell.czi.technology
• backend_wmg_url: https://pr-7359-backend-wmg.rdev.single-cell.czi.technology
• frontend_url: https://pr-7359-frontend.rdev.single-cell.czi.technology
• delete_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7359-deletion:1
• migrate_db_task_definition_arn: arn:aws:ecs:us-west-2:***:task-definition/dp-rdev-pr-7359-migration:1

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.90%. Comparing base (0f6646b) to head (f968ffe).

Files with missing lines	Patch %	Lines
backend/common/utils/result_notification.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7359      +/-   ##
==========================================
- Coverage   92.91%   92.90%   -0.01%     
==========================================
  Files         194      194              
  Lines       16827    16832       +5     
==========================================
+ Hits        15635    15638       +3     
- Misses       1192     1194       +2     

Flag	Coverage Δ
unittests	92.90% <77.77%> (-0.01%)	⬇️

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