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_tests.rs

@@ -13,7 +13,10 @@ use project::FakeFs;
 use rand::{rngs::StdRng, seq::IteratorRandom as _, Rng};
 use serde_json::json;
 use settings::SettingsStore;
-use std::{env, path::Path};
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
 use unindent::Unindent as _;
 use util::{post_inc, RandomCharIter};