new path picker (#11015)

Still TODO:

* Disable the new save-as for local projects
* Wire up sending the new path to the remote server

Release Notes:

- Added the ability to "Save-as" in remote projects

---------

Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Bennet <bennetbo@gmx.de>

crates/diagnostics/src/diagnostics.rs

@@ -36,7 +36,6 @@ use std::{
     cmp::Ordering,
     mem,
     ops::Range,
-    path::PathBuf,
 };
 use theme::ActiveTheme;
 pub use toolbar_controls::ToolbarControls;
@@ -740,7 +739,7 @@ impl Item for ProjectDiagnosticsEditor {
     fn save_as(
         &mut self,
         _: Model<Project>,
-        _: PathBuf,
+        _: ProjectPath,
         _: &mut ViewContext<Self>,
     ) -> Task<Result<()>> {
         unreachable!()