Cleanups preparing for WindowContext refactor (#22475)

* Remove unnecessary WindowContext and ViewContext '_ lifetimes

* Removed some cases where WindowContext has a different name than `cx`.

Release Notes:

- N/A

crates/editor/src/clangd_ext.rs

@@ -16,7 +16,7 @@ fn is_c_language(language: &Language) -> bool {
 pub fn switch_source_header(
     editor: &mut Editor,
     _: &SwitchSourceHeader,
-    cx: &mut ViewContext<'_, Editor>,
+    cx: &mut ViewContext<Editor>,
 ) {
     let Some(project) = &editor.project else {
         return;