Remove file path information and query by file id only

[!TIP]

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We've seen some issues over the time that are related to filesystem setups, be it performance wise or returning inaccurate path information (sometimes intended, sometimes by accident). On locally cached information it is even possible that the file is moved on the server, but it is not updated on the clients.
On iOS we recently changed how we query file information from being path based, to fileid based (ref https://github.com/nextcloud/talk-ios/pull/2598), to work around several issues. We did a query anyway before opening a file, to check if we still have the correct file cached, or if it was changed on the server (and then we don't want to display outdated files).

The question is now if we can do the same on all clients and completely remove setting up the filesystem from Talk for every user.

• Ref https://github.com/nextcloud/spreed/issues/16828

Rough todo:

• Ensure the rich object is still valid without a path (or is empty path okay?)
• Implement it on android (iOS already done)
• Check if viewer can do it directly (passing a fileid, instead of a path and name) or if we can just do a PROPFIND by fileid and pass that to viewer
• After some time, remove filesystem code server side and require updated clients

Begin with the existing iOS file-id query referenced in talk-ios PR #2598 and compare the Android, viewer, and server-side filesystem paths. Verify rich objects and viewer behavior without paths, then confirm that clients query by file ID before considering removal of the server-side filesystem code.