Fix clippy::redundant_clone lint violations (#36558)

This removes around 900 unnecessary clones, ranging from cloning a few
ints all the way to large data structures and images.

A lot of these were fixed using `cargo clippy --fix --workspace
--all-targets`, however it often breaks other lints and needs to be run
again. This was then followed up with some manual fixing.

I understand this is a large diff, but all the changes are pretty
trivial. Rust is doing some heavy lifting here for us. Once I get it up
to speed with main, I'd appreciate this getting merged rather sooner
than later.

Release Notes:

- N/A

crates/agent_ui/src/text_thread_editor.rs

@@ -1739,7 +1739,7 @@ impl TextThreadEditor {
                                 render_slash_command_output_toggle,
                                 |_, _, _, _| Empty.into_any(),
                             )
-                            .with_metadata(metadata.crease.clone())
+                            .with_metadata(metadata.crease)
                         }),
                         cx,
                     );
@@ -1810,7 +1810,7 @@ impl TextThreadEditor {
                 .filter_map(|(anchor, render_image)| {
                     const MAX_HEIGHT_IN_LINES: u32 = 8;
                     let anchor = buffer.anchor_in_excerpt(excerpt_id, anchor).unwrap();
-                    let image = render_image.clone();
+                    let image = render_image;
                     anchor.is_valid(&buffer).then(|| BlockProperties {
                         placement: BlockPlacement::Above(anchor),
                         height: Some(MAX_HEIGHT_IN_LINES),
@@ -1873,7 +1873,7 @@ impl TextThreadEditor {
     }
 
     fn render_send_button(&self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
-        let focus_handle = self.focus_handle(cx).clone();
+        let focus_handle = self.focus_handle(cx);
 
         let (style, tooltip) = match token_state(&self.context, cx) {
             Some(TokenState::NoTokensLeft { .. }) => (
@@ -2015,7 +2015,7 @@ impl TextThreadEditor {
             None => IconName::Ai,
         };
 
-        let focus_handle = self.editor().focus_handle(cx).clone();
+        let focus_handle = self.editor().focus_handle(cx);
 
         PickerPopoverMenu::new(
             self.language_model_selector.clone(),