Fully support chat for all project files

[fuzyll]

What is the feature you'd like to have?
Right now, chat is supported for .bndbs in remote projects, but not entirely supported for new files or files that aren't a BNDB yet.

Is your feature request related to a problem?
Chat should be supported in all scenarios related to a remote project.

Additional Information:
Split out from an internal issue. We should also make sure to show chat for local databases that have it cached as well.

[negasora]

Chat is already shown for local databases, that was fixed at some point.

Note for whoever ends up implementing this: I think that if you have chat history for a file, then a user creates a bndb for that file, they'd expect the chat history to be carried over to the database.