fix: (MICROBA-1743) Minor UI updates after bug bash

[MICROBA-1743]

* Remove `instructor` from the path of the bulk course email tool in the Comms MFE.
* Remove `file` option from TinyMCE text editor.

src/components/bulk-email-tool/text-editor/TextEditor.jsx

@@ -31,6 +31,7 @@ export default function TextEditor(props) {
         selector: 'textarea#editor',
         height: 600,
         branding: false,
+        menubar: 'edit view insert format table tools',
         plugins: 'advlist code emoticons link lists table image language',
         toolbar: 'formatselect fontselect bold italic underline forecolor | code bullist numlist alignlef aligncenter alignright alignjustify indent | blockquote link emoticons image | language',
         skin: false,