feat: associate a photo to a gift

[asbiin]

This close #3098

Backend/models changes

• The API has been updated.
• API's documentation has been added by submitting a pull request in the marketing website repository.
• Tests have been added for the new code.
• If you change a model, make sure the FakeContentTableSeeder is updated. We need seeders to develop locally and generate fake data.

If the code changes the SQL schema

• Make sure exporting account data as SQL is still working.
• Make sure your changes do not break importing data with vCard and .csv files.
• Make sure account reset and deletion still work.

Other tasks

• CHANGELOG entry added, if necessary, under UNRELEASED.
• If it's relevant and worth mentioning, create a changelog entry for this change. The changelog entry will appear inside the UI for all users to see. To know if your change is worth the creation of a changelog entry, read the documentation.

[djaiss]

It looks great!! Good job @asbiin

[djaiss]

Beware - the GenerateDummyData script does not work with this branch anymore. You need to update it as well.

[asbiin]

@djaiss a lot of changes has been made, I think the UX is now ok, can you test it please?

[djaiss]

Again, super job!

[djaiss]

Great for me 😀 Good job man!

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