remote projects per user (#10594)

Release Notes:

- Made remote projects per-user instead of per-channel. If you'd like to
be part of the remote development alpha, please email hi@zed.dev.

---------

Co-authored-by: Bennet Bo Fenner <53836821+bennetbo@users.noreply.github.com>
Co-authored-by: Bennet <bennetbo@gmx.de>
Co-authored-by: Nate Butler <1714999+iamnbutler@users.noreply.github.com>
Co-authored-by: Nate Butler <iamnbutler@gmail.com>

crates/collab/src/tests/channel_tests.rs

@@ -1023,6 +1023,8 @@ async fn test_channel_link_notifications(
         .await
         .unwrap();
 
+    executor.run_until_parked();
+
     // the new channel shows for b and c
     assert_channels_list_shape(
         client_a.channel_store(),