Open new windows with a default size and position (#9204)

This PR changes GPUI to open windows with a default size and location,
and to otherwise inherit from their spawning window.

Note: The linux build now crashes on startup.

Release Notes:

- N/A

---------

Co-authored-by: Nathan <nathan@zed.dev>
Co-authored-by: Ezekiel Warren <zaucy@users.noreply.github.com>

crates/collab/src/tests/test_server.rs

@@ -265,7 +265,7 @@ impl TestServer {
             workspace_store,
             languages: Arc::new(language_registry),
             fs: fs.clone(),
-            build_window_options: |_, _, _| Default::default(),
+            build_window_options: |_, _| Default::default(),
             node_runtime: FakeNodeRuntime::new(),
         });