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/assistant_context/src/assistant_context_tests.rs

@@ -1321,7 +1321,7 @@ fn test_summarize_error(
 fn setup_context_editor_with_fake_model(
     cx: &mut TestAppContext,
 ) -> (Entity<AssistantContext>, Arc<FakeLanguageModel>) {
-    let registry = Arc::new(LanguageRegistry::test(cx.executor().clone()));
+    let registry = Arc::new(LanguageRegistry::test(cx.executor()));
 
     let fake_provider = Arc::new(FakeLanguageModelProvider::default());
     let fake_model = Arc::new(fake_provider.test_model());
@@ -1376,7 +1376,7 @@ fn messages_cache(
     context
         .read(cx)
         .messages(cx)
-        .map(|message| (message.id, message.cache.clone()))
+        .map(|message| (message.id, message.cache))
         .collect()
 }