Update how `workspace::pane::Pane` handles the `RevealInProjectPanel`
action so as to display a notification when the user attempts to reveal
an unsaved buffer or a file that does not belong to any of the open
projects.

Closes #23967 

Release Notes:

- Update `pane: reveal in project panel` to display a notification when
the user attempts to use it with an unsaved buffer or a file that is not
part of the open projects

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Signed-off-by: Pratik Karki <pratik@prertik.com>
Co-authored-by: dino <dinojoaocosta@gmail.com>