Warn users that links to S3 resources are public

[rocketeerbkw]

There are a few places in the api/ui where Lagoon stores and retrieves files. Currently these are environment backups, task files and insights. The files are retrieved directly from S3 using a signed/short-lived link, meaning no Lagoon authorization is performed once a link is generated.

User may not understand that links used to download these files do not require authentication nor authorization and should be treated securely. The only mitigation if a user exposes the link inadvertently is that it is valid for a short amount of time (currently 5 minutes).

We could inform users of this situation by warning users in the UI. Instead of the download button being a link, it could open a popup with a warning and have the link in there.

Further UX/UI discussion is welcome.