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/components/DiffFileTree.vue

@@ -7,6 +7,7 @@ import {diffTreeStore, filterDiffTree, applyFiltersToFileBoxes, extensionFilterT
 import {setFileFolding} from '../features/file-fold.ts';
 import {onMounted, onUnmounted, computed, watch} from 'vue';
 import {localUserSettings} from '../modules/user-settings.ts';
+import {registerAsyncHashChangeListener, removeAsyncHashChangeListener} from '../modules/hashchange.ts';
 
 const LOCAL_STORAGE_KEY = 'diff_file_tree_visible';
 
@@ -28,13 +29,12 @@ onMounted(() => {
   // while the tree is hidden there is no control to clear a filter restored from the URL
   if (store.fileTreeIsVisible) applyFiltersToFileBoxes(store); else store.activeExtensions = 'all';
   document.querySelector('.diff-toggle-file-tree-button')!.addEventListener('click', toggleVisibility);
-  hashChangeListener();
-  window.addEventListener('hashchange', hashChangeListener);
+  registerAsyncHashChangeListener(hashChangeListener);
 });
 
 onUnmounted(() => {
   document.querySelector('.diff-toggle-file-tree-button')!.removeEventListener('click', toggleVisibility);
-  window.removeEventListener('hashchange', hashChangeListener);
+  removeAsyncHashChangeListener(hashChangeListener);
 });
 
 function hashChangeListener() {