Git askpass (#25953)

Supersedes #25848

Release Notes:

- git: Supporting push/pull/fetch when remote requires auth

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/zed/src/main.rs

@@ -508,7 +508,6 @@ fn main() {
         outline::init(cx);
         project_symbols::init(cx);
         project_panel::init(cx);
-        git_ui::git_panel::init(cx);
         outline_panel::init(cx);
         component_preview::init(cx);
         tasks_ui::init(cx);