title_bar: Simplify git-ui feature flag check (#23475)

This PR is a follow-up to
https://github.com/zed-industries/zed/pull/23470 that simplifies the way
we check the `git-ui` feature flag in the title bar.

Release Notes:

- N/A

crates/git_ui/src/git_ui.rs

@@ -1,6 +1,4 @@
 use ::settings::Settings;
-use feature_flags::WaitForFlag;
-use futures::{select_biased, FutureExt};
 use git::status::FileStatus;
 use git_panel_settings::GitPanelSettings;
 use gpui::{AppContext, Hsla};
@@ -14,17 +12,6 @@ pub fn init(cx: &mut AppContext) {
     GitPanelSettings::register(cx);
 }
 
-// TODO: Remove this before launching Git UI
-pub async fn git_ui_enabled(flag: WaitForFlag) -> bool {
-    let mut git_ui_feature_flag = flag.fuse();
-    let mut timeout = FutureExt::fuse(smol::Timer::after(std::time::Duration::from_secs(5)));
-
-    select_biased! {
-        is_git_ui_enabled = git_ui_feature_flag => is_git_ui_enabled,
-        _ = timeout => false,
-    }
-}
-
 const ADDED_COLOR: Hsla = Hsla {
     h: 142. / 360.,
     s: 0.68,