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/globals.ts

@@ -1,6 +1,5 @@
 import jquery from 'jquery'; // eslint-disable-line no-restricted-imports
 import htmx from 'htmx.org'; // eslint-disable-line no-restricted-imports
-import 'idiomorph/htmx'; // eslint-disable-line no-restricted-imports
 
 // Some users still use inline scripts and expect jQuery to be available globally.
 // To avoid breaking existing users and custom plugins, import jQuery globally without ES module.