test(e2e): add InstanceConfigureFixture (template+attr+connection+area+instance on site-a)

Also extends AddAttributeAsync with an optional dataSourceReference parameter
so the fixture attribute appears in both _bindingDataSourceAttrs (bindings UI)
and _overrideAttrs (overrides UI) on the InstanceConfigure page.

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Cluster/CliRunner.Helpers.cs

@@ -70,14 +70,34 @@ public static partial class CliRunner
     /// (<c>Boolean</c>, <c>Int32</c>, <c>Double</c>, <c>String</c>).
     /// Defaults to <c>Double</c>.
     /// </param>
+    /// <param name="dataSourceReference">
+    /// Optional data source reference (tag path). When provided, maps to
+    /// <c>--data-source</c> on the CLI and sets
+    /// <c>TemplateAttribute.DataSourceReference</c>. The InstanceConfigure page
+    /// populates <c>_bindingDataSourceAttrs</c> by filtering attributes to those
+    /// where <c>DataSourceReference</c> is non-empty, so an attribute that needs
+    /// to appear in the Connection Bindings panel MUST be created with this set.
+    /// </param>
     /// <exception cref="InvalidOperationException">The CLI failed.</exception>
-    public static async Task AddAttributeAsync(int templateId, string name, string dataType = "Double")
+    public static async Task AddAttributeAsync(
+        int templateId, string name, string dataType = "Double",
+        string? dataSourceReference = null)
     {
-        await RunAsync(
+        var inv = System.Globalization.CultureInfo.InvariantCulture;
+        var args = new List<string>
+        {
             "template", "attribute", "add",
-            "--template-id", templateId.ToString(System.Globalization.CultureInfo.InvariantCulture),
+            "--template-id", templateId.ToString(inv),
             "--name", name,
-            "--data-type", dataType);
+            "--data-type", dataType,
+        };
+        if (!string.IsNullOrEmpty(dataSourceReference))
+        {
+            args.Add("--data-source");
+            args.Add(dataSourceReference);
+        }
+
+        await RunAsync([.. args]);
     }
 
     /// <summary>