Remove jQuery class from the diff view (#30176)

- Switched from jQuery class functions to plain JavaScript `classList`
- Tested the diff view functionality and it works as before

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Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: silverwind <me@silverwind.io>

web_src/js/utils/dom.js

@@ -51,7 +51,7 @@ export function isElemHidden(el) {
   return res[0];
 }
 
-export function queryElemSiblings(el, selector) {
+export function queryElemSiblings(el, selector = '*') {
   return Array.from(el.parentNode.children).filter((child) => child !== el && child.matches(selector));
 }