vim: Add :Git (#27874)

Just adding to the existing https://zed.dev/docs/vim#ex-commands

Captial G is not used by vim commands.

Release Notes:

- N/A

crates/vim/src/command.rs

@@ -876,6 +876,7 @@ fn generate_commands(_: &App) -> Vec<VimCommand> {
         VimCommand::str(("Ch", "at"), "chat_panel::ToggleFocus"),
         VimCommand::str(("No", "tifications"), "notification_panel::ToggleFocus"),
         VimCommand::str(("A", "I"), "assistant::ToggleFocus"),
+        VimCommand::str(("G", "it"), "git_panel::ToggleFocus"),
         VimCommand::new(("noh", "lsearch"), search::buffer_search::Dismiss),
         VimCommand::new(("$", ""), EndOfDocument),
         VimCommand::new(("%", ""), EndOfDocument),