Rebuild buffer store to be aware of remote/local distinction (#18303)

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/collab/src/tests/remote_editing_collaboration_tests.rs

@@ -3,6 +3,7 @@ use call::ActiveCall;
 use fs::{FakeFs, Fs as _};
 use gpui::{Context as _, TestAppContext};
 use language::language_settings::all_language_settings;
+use project::ProjectPath;
 use remote::SshSession;
 use remote_server::HeadlessProject;
 use serde_json::json;
@@ -108,14 +109,36 @@ async fn test_sharing_an_ssh_remote_project(
     });
 
     project_b
-        .update(cx_b, |project, cx| project.save_buffer(buffer_b, cx))
+        .update(cx_b, |project, cx| {
+            project.save_buffer_as(
+                buffer_b.clone(),
+                ProjectPath {
+                    worktree_id: worktree_id.to_owned(),
+                    path: Arc::from(Path::new("src/renamed.rs")),
+                },
+                cx,
+            )
+        })
         .await
         .unwrap();
     assert_eq!(
         remote_fs
-            .load("/code/project1/src/lib.rs".as_ref())
+            .load("/code/project1/src/renamed.rs".as_ref())
             .await
             .unwrap(),
         "fn one() -> usize { 100 }"
     );
+    cx_b.run_until_parked();
+    cx_b.update(|cx| {
+        assert_eq!(
+            buffer_b
+                .read(cx)
+                .file()
+                .unwrap()
+                .path()
+                .to_string_lossy()
+                .to_string(),
+            "src/renamed.rs".to_string()
+        );
+    });
 }