Refactor htmx and fetch-action related code (#37186)

This is the first step (the hardest part):

* repo file list last commit message lazy load
* admin server status monitor
* watch/unwatch (normal page, watchers page)
* star/unstar (normal page, watchers page)
* project view, delete column
* workflow dispatch, switch the branch
* commit page: load branches and tags referencing this commit

The legacy "data-redirect" attribute is removed, it only makes the page
reload (sometimes using an incorrect link).

Also did cleanup for some devtest pages.

web_src/js/features/comp/WebHookEditor.ts

@@ -37,11 +37,6 @@ export function initCompWebHookEditor() {
   document.querySelector<HTMLButtonElement>('#test-delivery')?.addEventListener('click', async function () {
     this.classList.add('is-loading', 'disabled');
     await POST(this.getAttribute('data-link')!);
-    setTimeout(() => {
-      const redirectUrl = this.getAttribute('data-redirect');
-      if (redirectUrl) {
-        window.location.href = redirectUrl;
-      }
-    }, 5000);
+    setTimeout(() => window.location.reload(), 5000);
   });
 }