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/actions/workflow_dispatch_inputs.tmpl

@@ -1,3 +1,4 @@
+<div id="runWorkflowDispatchModalInputs">
 {{if not .WorkflowDispatchConfig}}
 	<div class="ui error message tw-block">{{/* using "ui message" in "ui form" needs to force to display */}}
 		{{if not .CurWorkflowExists}}
@@ -44,3 +45,4 @@
 		</div>
 	{{end}}
 {{end}}
+</div>