Remove jQuery `.attr` from the repository settings (#30018)

- Switched from jQuery `.attr` to plain javascript `getAttribute` and
`setAttribute`
- Tested the collaborator access mode change, team search box, and
branch protection form. They all work as before

---------

Signed-off-by: Yarden Shoham <git@yardenshoham.com>

web_src/js/features/repo-settings.js

@@ -8,22 +8,22 @@ const {appSubUrl, csrfToken} = window.config;
 
 export function initRepoSettingsCollaboration() {
   // Change collaborator access mode
-  $('.page-content.repository .ui.dropdown.access-mode').each((_, e) => {
-    const $dropdown = $(e);
+  $('.page-content.repository .ui.dropdown.access-mode').each((_, el) => {
+    const $dropdown = $(el);
     const $text = $dropdown.find('> .text');
     $dropdown.dropdown({
       async action(_text, value) {
-        const lastValue = $dropdown.attr('data-last-value');
+        const lastValue = el.getAttribute('data-last-value');
         try {
-          $dropdown.attr('data-last-value', value);
+          el.setAttribute('data-last-value', value);
           $dropdown.dropdown('hide');
           const data = new FormData();
-          data.append('uid', $dropdown.attr('data-uid'));
+          data.append('uid', el.getAttribute('data-uid'));
           data.append('mode', value);
-          await POST($dropdown.attr('data-url'), {data});
+          await POST(el.getAttribute('data-url'), {data});
         } catch {
           $text.text('(error)'); // prevent from misleading users when error occurs
-          $dropdown.attr('data-last-value', lastValue);
+          el.setAttribute('data-last-value', lastValue);
         }
       },
       onChange(_value, text, _$choice) {
@@ -32,9 +32,9 @@ export function initRepoSettingsCollaboration() {
       onHide() {
         // set to the really selected value, defer to next tick to make sure `action` has finished its work because the calling order might be onHide -> action
         setTimeout(() => {
-          const $item = $dropdown.dropdown('get item', $dropdown.attr('data-last-value'));
+          const $item = $dropdown.dropdown('get item', el.getAttribute('data-last-value'));
           if ($item) {
-            $dropdown.dropdown('set selected', $dropdown.attr('data-last-value'));
+            $dropdown.dropdown('set selected', el.getAttribute('data-last-value'));
           } else {
             $text.text('(none)'); // prevent from misleading users when the access mode is undefined
           }
@@ -45,11 +45,13 @@ export function initRepoSettingsCollaboration() {
 }
 
 export function initRepoSettingSearchTeamBox() {
-  const $searchTeamBox = $('#search-team-box');
-  $searchTeamBox.search({
+  const searchTeamBox = document.getElementById('search-team-box');
+  if (!searchTeamBox) return;
+
+  $(searchTeamBox).search({
     minCharacters: 2,
     apiSettings: {
-      url: `${appSubUrl}/org/${$searchTeamBox.attr('data-org-name')}/teams/-/search?q={query}`,
+      url: `${appSubUrl}/org/${searchTeamBox.getAttribute('data-org-name')}/teams/-/search?q={query}`,
       headers: {'X-Csrf-Token': csrfToken},
       onResponse(response) {
         const items = [];
@@ -77,11 +79,11 @@ export function initRepoSettingGitHook() {
 export function initRepoSettingBranches() {
   if (!$('.repository.settings.branches').length) return;
   $('.toggle-target-enabled').on('change', function () {
-    const $target = $($(this).attr('data-target'));
+    const $target = $(this.getAttribute('data-target'));
     $target.toggleClass('disabled', !this.checked);
   });
   $('.toggle-target-disabled').on('change', function () {
-    const $target = $($(this).attr('data-target'));
+    const $target = $(this.getAttribute('data-target'));
     if (this.checked) $target.addClass('disabled'); // only disable, do not auto enable
   });
   $('#dismiss_stale_approvals').on('change', function () {