use correct header schema for BeginSkill (#5767)

* use correct header schema for BeginSkill

* Update tests.uischema

Co-authored-by: Monica Rivera <moniriv@microsoft.com>

libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Schemas/Actions/Microsoft.BeginSkill.uischema

@@ -14,18 +14,21 @@
     },
     "flow": {
         "widget": "ActionCard",
-        "colors": {
-            "theme": "#004578",
-            "color": "#FFFFFF",
-            "icon": "#FFFFFF"
-        },
-        "icon": "Library",
         "body": {
             "widget": "ResourceOperation",
             "operation": "Host",
             "resource": "=coalesce(action.skillEndpoint, \"?\")",
             "singleline": true
         },
+        "header": {
+            "widget": "ActionHeader",
+            "colors": {
+                "theme": "#004578",
+                "color": "#FFFFFF",
+                "icon": "#FFFFFF"
+            },
+            "icon": "Library"
+        },
         "footer": {
             "widget": "PropertyDescription",
             "property": "=action.resultProperty",

tests/tests.uischema

@@ -144,18 +144,21 @@
         "singleline": true,
         "widget": "ResourceOperation"
       },
-      "colors": {
-        "color": "#FFFFFF",
-        "icon": "#FFFFFF",
-        "theme": "#004578"
-      },
       "footer": {
         "description": "= Result",
         "property": "=action.resultProperty",
         "widget": "PropertyDescription"
       },
-      "hideFooter": "=!action.resultProperty",
+      "header": {
+        "colors": {
+          "color": "#FFFFFF",
+          "icon": "#FFFFFF",
+          "theme": "#004578"
+        },
         "icon": "Library",
+        "widget": "ActionHeader"
+      },
+      "hideFooter": "=!action.resultProperty",
       "widget": "ActionCard"
     },
     "form": {