Disable swift for now (#8291)

It causes segfaults on load

Release Notes:

- Fixed a segfault opening a Swift file with the Swift extension
installed.

crates/extension/src/extension_store.rs

@@ -406,6 +406,10 @@ impl ExtensionStore {
             }));
 
         for language_name in &languages_to_add {
+            if language_name.as_ref() == "Swift" {
+                continue;
+            }
+
             let language = manifest.languages.get(language_name.as_ref()).unwrap();
             let mut language_path = self.extensions_dir.clone();
             language_path.extend([language.extension.as_ref(), language.path.as_path()]);