Use explicit jQuery import, remove unused eslint globals (#18435)

- Don't rely on globals (window.$) for jQuery import
- Remove eslint globals no longer in use

web_src/js/features/repo-issue.js

@@ -1,3 +1,4 @@
+import $ from 'jquery';
 import {htmlEscape} from 'escape-goat';
 import attachTribute from './tribute.js';
 import {createCommentEasyMDE, getAttachedEasyMDE} from './comp/EasyMDE.js';