chore: refactor legacy JS init code to use "data-global-init" (#39836)

Move the remaining legacy init code, which probed page classes with
`querySelector`, to `data-global-init`, so each feature initializes from
its own element. `hashchange` listeners now go through one module that
runs them in priority order, because independent listeners broke when
mount order changed.

- Convert issue list, diff, repo create, settings and org team inits to
`data-global-init`
- Run `hashchange` listeners by priority, the diff scroll handler last
- Make the devtest mock's failing log requests deterministic
- Add e2e tests for diff tree navigation to folded files and job log
permalinks

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Co-authored-by: silverwind <me@silverwind.io>

web_src/js/features/repo-code.ts

@@ -1,6 +1,7 @@
 import {svg} from '../svg.ts';
 import {createTippy} from '../modules/tippy.ts';
 import {addDelegatedEventListener} from '../utils/dom.ts';
+import {registerAsyncHashChangeListener} from '../modules/hashchange.ts';
 
 function changeHash(hash: string) {
   if (window.history.pushState) {
@@ -142,6 +143,5 @@ export function initRepoCodeView() {
       showLineButton();
     }
   };
-  onHashChange();
-  window.addEventListener('hashchange', onHashChange);
+  registerAsyncHashChangeListener(onHashChange);
 }