feat: admin impersonates a user (#38614)

* fix #3631
* fix #21599

by the way, refactored the "profile avatar card" to simplify the code.

templates/admin/user/view.tmpl

@@ -6,7 +6,8 @@
 			<h4 class="ui top attached header">
 				{{.Title}}
 				<div class="ui right">
-					<a class="ui primary tiny button" href="{{.Link}}/edit">{{ctx.Locale.Tr "admin.users.edit"}}</a>
+					<button class="ui primary compact tiny basic button link-action" data-url="{{.Link}}/impersonate">{{ctx.Locale.Tr "admin.users.impersonate"}}</button>
+					<a class="ui primary compact tiny button" href="{{.Link}}/edit">{{ctx.Locale.Tr "admin.users.edit"}}</a>
 				</div>
 			</h4>
 			<div class="ui attached segment">