Add an 'add-attachment' action to the GTAM detail endpoints

[PartyNell]

Description

Allow attachments to be added to signage, interventions and infrastructure, and report on objects with specific endpoints.

Related Issue

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
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AI requirements

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.54%. Comparing base (01031f9) to head (849311d).
⚠️ Report is 21 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5663   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files         274      274           
  Lines       23034    23103   +69     
=======================================
+ Hits        22699    22768   +69     
  Misses        335      335           

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[cypress]

Geotrek-admin    Run #17747

Run Properties:   Passed #17747  •  8bdf7e4012 ℹ️: Merge 849311da4325513a3914b40e29c5257999a7c3ba into 016b491eec0d9b833800da1accda...

Project	Geotrek-admin
Branch Review	refs/pull/5663/merge
Run status	Passed #17747
Run duration	02m 15s
Commit	8bdf7e4012 ℹ️: Merge 849311da4325513a3914b40e29c5257999a7c3ba into 016b491eec0d9b833800da1accda...
Committer	Nell Party
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎