Move SystemUIGoogleScreenshotTests to its own test config.

Bug: 300962465
Test: presubmit
Change-Id: I102df49327a01169f04d78687fe4ee47b74bc6e6
diff --git a/packages/SystemUI/TEST_MAPPING b/packages/SystemUI/TEST_MAPPING
index af6fa86..5c2f979 100644
--- a/packages/SystemUI/TEST_MAPPING
+++ b/packages/SystemUI/TEST_MAPPING
@@ -131,5 +131,22 @@
         }
       ]
     }
+  ],
+  // v2/sysui/suite/test-mapping-sysui-screenshot-test
+  "sysui-screenshot-test": [
+    {
+      "name": "SystemUIGoogleScreenshotTests",
+      "options": [
+        {
+          "exclude-annotation": "org.junit.Ignore"
+        },
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        },
+        {
+          "exclude-annotation": "android.platform.test.annotations.Postsubmit"
+        }
+      ]
+    }
   ]
 }