refactor: update timers (#729)

* refactor: remove duplication

* refactor: previous times

* refactor: event patching

apps/client/src/features/rundown/event-editor/EventEditor.tsx

@@ -61,7 +61,7 @@ export default function EventEditor() {
   );
 
   if (!event) {
-    return <span>Loading...</span>;
+    return <span data-testid='editor-container'>Loading...</span>;
   }
 
   // Compositing user fields by hand
@@ -80,7 +80,7 @@ export default function EventEditor() {
   };
 
   return (
-    <div className={style.eventEditor}>
+    <div className={style.eventEditor} data-testid='editor-container'>
       <div>HEADER ACTIONS?</div>
       <div className={style.content}>
         <EventEditorTimes