Add typo detection to CI (#4107)

Adding the typos crate to our CI will take some doing, as we have
several tests which rely on typos in various ways (e.g. checking state
as the user types), but I thought I'd take a first stab at fixing what
it finds.

Release Notes:

- N/A

crates/assistant/src/assistant_panel.rs

@@ -2918,7 +2918,7 @@ impl InlineAssistant {
         let semantic_permissioned = self.semantic_permissioned(cx);
         if let Some(semantic_index) = SemanticIndex::global(cx) {
             cx.spawn(|_, mut cx| async move {
-                // This has to be updated to accomodate for semantic_permissions
+                // This has to be updated to accommodate for semantic_permissions
                 if semantic_permissioned.await.unwrap_or(false) {
                     semantic_index
                         .update(&mut cx, |index, cx| index.index_project(project, cx))?