Make signed URLs for output datasets optional

[cortadocodes]

Contents (#676)

IMPORTANT: There is 1 breaking change.

Enhancements

• Allow using non-signed URLs for datasets in output manifest (controllable via the app configuration file)
• Handle all requests errors while:
  • Getting cloud metadata for datafiles and datasets
  • Downloading datafiles

Fixes

• Avoid trying to access buckets for URL datasets

Refactoring

• 💥 BREAKING CHANGE: Stop storing output_location in Analysis
• Remove unnecessary finalisation from template apps

---

Upgrade instructions

💥 Stop storing `output_location` in `Analysis`

If calling Analysis.finalise manually, either stop doing this and rely on the output_location field of the app configuration or explicitly pass in the upload_output_datasets_to argument.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.59%. Comparing base (9092646) to head (402c8e5).
Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #676      +/-   ##
==========================================
+ Coverage   94.50%   94.59%   +0.09%     
==========================================
  Files          83       83              
  Lines        3547     3589      +42     
==========================================
+ Hits         3352     3395      +43     
+ Misses        195      194       -1     

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