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.js

@@ -1,6 +1,7 @@
 import $ from 'jquery';
 import {initFomanticApiPatch} from './fomantic/api.js';
 import {initAriaCheckboxPatch} from './fomantic/checkbox.js';
+import {initAriaFormFieldPatch} from './fomantic/form.js';
 import {initAriaDropdownPatch} from './fomantic/dropdown.js';
 import {initAriaModalPatch} from './fomantic/modal.js';
 import {initFomanticTransition} from './fomantic/transition.js';
@@ -27,6 +28,7 @@ export function initGiteaFomantic() {
 
   // Use the patches to improve accessibility, these patches are designed to be as independent as possible, make it easy to modify or remove in the future.
   initAriaCheckboxPatch();
+  initAriaFormFieldPatch();
   initAriaDropdownPatch();
   initAriaModalPatch();
 }