refactor: convert contentScriptsUtils to Typescript

Change-Id: I78031a291a34198ac6335a4ee42eb23753f2c37b
diff --git a/src/injections/litComponentsInject.js b/src/injections/litComponentsInject.js
index b1c40cf..ce8ace8 100644
--- a/src/injections/litComponentsInject.js
+++ b/src/injections/litComponentsInject.js
@@ -7,7 +7,7 @@
 import '../contentScripts/communityConsole/flattenThreads/components/index.js';
 import '../contentScripts/communityConsole/updateHandler/banner/components/index.js';
 
-import {injectStylesheet} from '../common/contentScriptsUtils.js';
+import {injectStylesheet} from '../common/contentScriptsUtils';
 
 // Also, we import Material Symbols Outlined since the Community Console uses
 // "Google Material Icons" instead. This is necessary for the MD3 components.