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.

templates/repo/settings/webhook/history.tmpl

@@ -6,7 +6,7 @@
 			<div class="ui right">
 				<!-- the button is wrapped with a span because the tooltip doesn't show on hover if we put data-tooltip-content directly on the button -->
 				<span data-tooltip-content="{{if or $isNew .Webhook.IsActive}}{{ctx.Locale.Tr "repo.settings.webhook.test_delivery_desc"}}{{else}}{{ctx.Locale.Tr "repo.settings.webhook.test_delivery_desc_disabled"}}{{end}}">
-					<button class="ui tiny button{{if not (or $isNew .Webhook.IsActive)}} disabled{{end}}" id="test-delivery" data-link="{{.Link}}/test" data-redirect="{{.Link}}">
+					<button class="ui tiny button{{if not (or $isNew .Webhook.IsActive)}} disabled{{end}}" id="test-delivery" data-link="{{.Link}}/test">
 						<span class="text">{{ctx.Locale.Tr "repo.settings.webhook.test_delivery"}}</span>
 					</button>
 			</span>