bug: Landscape profile images are accessible via URL without authentication

[shrouxm]

Description

Landscape profile images are accessible without authentication, even for private landscapes.

Steps To Reproduce

1. Go to a landscape profile that is not accessible without logging into Terraso
2. Right click the profile image and select "Copy image link" (or whatever your browser calls this action)
3. Open a private tab where you are not logged into Terraso, and paste that link

Expected behavior

The image should return a 404.

Actual behavior

The image appears.

Additional context

We should in fixing this issue review how we are managing access control on all of our static files so this doesn't happen unexpectedly with future potentially private data.