Add form field id generation, remove duplicated ids (#30546)

Fixes: https://github.com/go-gitea/gitea/issues/30384

On repo settings page, there id `repo_name` was used 5 times on the same
page, some in modal and such. I think we are better off just
auto-generating these IDs in the future so that labels link up with
their form element.

Ideally this id generation would be done in backend in a subtemplate,
but seeing that we already have similar JS patches for checkboxes, I
took the easy path for now.

I also checked that these `#repo_name` were not in use in JS and the
only case where this id appears in JS is on the migration page where
it's still there.

---------

Co-authored-by: Giteabot <teabot@gitea.io>

web_src/js/modules/fomantic/form.js

@@ -0,0 +1,13 @@
+import {linkLabelAndInput} from './base.js';
+
+export function initAriaFormFieldPatch() {
+  // link the label and the input element so it's clickable and accessible
+  for (const el of document.querySelectorAll('.ui.form .field')) {
+    if (el.hasAttribute('data-field-patched')) continue;
+    const label = el.querySelector(':scope > label');
+    const input = el.querySelector(':scope > input');
+    if (!label || !input) continue;
+    linkLabelAndInput(label, input);
+    el.setAttribute('data-field-patched', 'true');
+  }
+}