Remove jQuery .map() and enable eslint rules for it (#29272)

- Use case in `repo-commit` was tested until the point where the POST
request was sent with the same payload.
- Use case in `repo-legacy` was tested completely with comment editing.
- `jquery/no-fade` was disabled as well to stay in sync with
`no-jquery/no-fade`, had no violations.

web_src/js/features/repo-legacy.js

@@ -398,17 +398,14 @@ async function onEditContent(event) {
     }
   };
 
-  const saveAndRefresh = (dz, $dropzone) => {
+  const saveAndRefresh = (dz) => {
     showElem($renderContent);
     hideElem($editContentZone);
-    const $attachments = $dropzone.find('.files').find('[name=files]').map(function () {
-      return $(this).val();
-    }).get();
     $.post($editContentZone.attr('data-update-url'), {
       _csrf: csrfToken,
       content: comboMarkdownEditor.value(),
       context: $editContentZone.attr('data-context'),
-      files: $attachments,
+      files: dz.files.map((file) => file.uuid),
     }, (data) => {
       if (!data.content) {
         $renderContent.html($('#no-content').html());
@@ -452,7 +449,7 @@ async function onEditContent(event) {
     });
     $editContentZone.find('.save.button').on('click', (e) => {
       e.preventDefault();
-      saveAndRefresh(dz, $dropzone);
+      saveAndRefresh(dz);
     });
   } else {
     comboMarkdownEditor = getComboMarkdownEditor($editContentZone.find('.combo-markdown-editor'));