User LiveViews: row_id and data-testid for actions

Table row_id for scoped selectors; data-testid on New/Edit/Delete.

lib/mv_web/live/user_live/show.ex

@@ -42,7 +42,11 @@ defmodule MvWeb.UserLive.Show do
             <span class="sr-only">{gettext("Back to users list")}</span>
           </.button>
           <%= if can?(@current_user, :update, @user) do %>
-            <.button variant="primary" navigate={~p"/users/#{@user}/edit?return_to=show"}>
+            <.button
+              variant="primary"
+              navigate={~p"/users/#{@user}/edit?return_to=show"}
+              data-testid="user-edit"
+            >
               <.icon name="hero-pencil-square" /> {gettext("Edit User")}
             </.button>
           <% end %>