Add mirror URI to service /index/file response (#7624)

[nadove-ucsc]

Linked issues: #7624

Checklist

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Operator (mirroring)

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• PR is assigned to no one

Shorthand for review comments

• L line is too long
• W line wrapping is wrong
• Q bad quotes
• F other formatting problem

[coveralls]

coverage: 85.108% (+0.05%) from 85.061%
when pulling fe0f02a on issues/nadove-ucsc/7624-add-mirror-uri-to-service-response
into 816c42a on develop.

[codecov]

Codecov Report

❌ Patch coverage is 91.16279% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.88%. Comparing base (816c42a) to head (fe0f02a).
⚠️ Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/azul/service/download_controller.py	92.51%	11 Missing ⚠️
src/azul/__init__.py	25.00%	6 Missing ⚠️
src/azul/indexer/mirror_service.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7637      +/-   ##
===========================================
+ Coverage    84.84%   84.88%   +0.04%     
===========================================
  Files          156      157       +1     
  Lines        22896    22943      +47     
===========================================
+ Hits         19425    19476      +51     
+ Misses        3471     3467       -4     

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[dsotirho-ucsc]

Approved.

[hannes-ucsc]

I'm not sure this indirection is necessary. For the file URL it is, because only the app/controller layer know the scheme, hostname, port and path components of that URL. But for a URI that is minted by the service, the stage should be able to reach directly into the service.