When the title in the issue has a value, set the text cursor at the end of the text. (#30090)

Fix:  [#25055](https://github.com/go-gitea/gitea/issues/25055)

Before

![image](1b89cd7b-4fa3-49aa-9b5e-a8413add436e)

After

![image](fa808f8d-d3ce-4245-a4fe-dd0282ba3fdf)

ps: I've noticed that we are gradually replacing jQuery, so I didn't use jQuery here.
(cherry picked from commit 1261dd6742fb7095e51c173ca4641477d81a3634)

web_src/js/features/autofocus-end.js

@@ -0,0 +1,6 @@
+export function initAutoFocusEnd() {
+  for (const el of document.querySelectorAll('.js-autofocus-end')) {
+    el.focus(); // expects only one such element on one page. If there are many, then the last one gets the focus.
+    el.setSelectionRange(el.value.length, el.value.length);
+  }
+}