Add Retry button when creating a mirror-repo fails (#26228)

fixed #26156 
* Added a retry button in the frontend (only displayed when the status
is abnormal)
* After clicking Retry, the backend adds the task back to the task queue


![7UJDNM671RI})EA8~~XPL39](https://github.com/go-gitea/gitea/assets/3371163/e088fd63-5dcc-4bc6-8849-7db3086511b7)

![T83F1WL9)VGHR@MB956$VT9](https://github.com/go-gitea/gitea/assets/3371163/744425bb-dde1-4315-be2e-5c99ac3a44d4)

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/repo-migrate.js

@@ -1,12 +1,14 @@
 import $ from 'jquery';
 import {hideElem, showElem} from '../utils/dom.js';
 
-const {appSubUrl} = window.config;
+const {appSubUrl, csrfToken} = window.config;
 
 export function initRepoMigrationStatusChecker() {
   const $repoMigrating = $('#repo_migrating');
   if (!$repoMigrating.length) return;
 
+  $('#repo_migrating_retry').on('click', doMigrationRetry);
+
   const task = $repoMigrating.attr('data-migrating-task-id');
 
   // returns true if the refresh still need to be called after a while
@@ -31,6 +33,7 @@ export function initRepoMigrationStatusChecker() {
     if (data.status === 3) {
       hideElem('#repo_migrating_progress');
       hideElem('#repo_migrating');
+      showElem('#repo_migrating_retry');
       showElem('#repo_migrating_failed');
       showElem('#repo_migrating_failed_image');
       $('#repo_migrating_failed_error').text(data.message);
@@ -53,3 +56,14 @@ export function initRepoMigrationStatusChecker() {
 
   syncTaskStatus(); // no await
 }
+
+async function doMigrationRetry(e) {
+  await fetch($(e.target).attr('data-migrating-task-retry-url'), {
+    method: 'post',
+    headers: {
+      'X-Csrf-Token': csrfToken,
+      'Content-Type': 'application/json',
+    },
+  });
+  window.location.reload();
+}