Remove feedback button from status bar (#9100)

This PR removes the feedback button from the status bar, as Nathan and I
discussed. We discussed the fact that we likely no longer need to take
up valuable screen real estate for this, with where Zed as at now.

This PR also moves the `Share Feedback...` collab menu item to the
`Help` menu, as that's where VS Code puts their action to send in-app
feedback (which might help with future discoverability) and renames it
to `Give Feedback...`, to make it consistent with the name of the
command palette action.

Release Notes:

- Removed the feedback button from the status bar.

crates/feedback/src/feedback_modal.rs

@@ -431,7 +431,7 @@ impl Render for FeedbackModal {
             .h(rems(32.))
             .p_4()
             .gap_2()
-            .child(Headline::new("Share Feedback"))
+            .child(Headline::new("Give Feedback"))
             .child(
                 Label::new(if self.character_count < *FEEDBACK_CHAR_LIMIT.start() {
                     format!(