Add setting to hide active language button in the status bar (#33977)

Release Notes:

- Added settings status_bar.show_active_language_button to show/hide the
language button in the status bar.

The motivation for this is visual, I have had zero issues with its
functionality.

The language switcher can still be accessed by the command palette,
menu, or a keyboard shortcut.

------

This is my first Zed and first Rust PR, so criticism is very welcome. 

I know there has been discussion around how the status bar settings are
structured and named, and I am happy to change it to whatever is best. I
was also not sure what order to put it in in the settings default.json.
Feedback welcome.

Here is a picture of it in action:


![image](https://github.com/user-attachments/assets/c50131e2-71aa-4fab-8db0-8b2aae586e71)

---------

Co-authored-by: zumbalogy <3770982+zumbalogy@users.noreply.github.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/language_selector/src/active_buffer_language.rs

@@ -1,8 +1,9 @@
-use editor::Editor;
+use editor::{Editor, EditorSettings};
 use gpui::{
     Context, Entity, IntoElement, ParentElement, Render, Subscription, WeakEntity, Window, div,
 };
 use language::LanguageName;
+use settings::Settings as _;
 use ui::{Button, ButtonCommon, Clickable, FluentBuilder, LabelSize, Tooltip};
 use workspace::{StatusItemView, Workspace, item::ItemHandle};
 
@@ -39,6 +40,13 @@ impl ActiveBufferLanguage {
 
 impl Render for ActiveBufferLanguage {
     fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        if !EditorSettings::get_global(cx)
+            .status_bar
+            .active_language_button
+        {
+            return div();
+        }
+
         div().when_some(self.active_language.as_ref(), |el, active_language| {
             let active_language_text = if let Some(active_language_text) = active_language {
                 active_language_text.to_string()