Move StagedRollbackTest to group presubmit-large

The test config takes longer than 15mins to run. Move it to a dedicated
group for running slow presubmit Test Mapping test.

Bug: 174654670
Bug: 174495337
Change-Id: Iabcbaacfb14133de0d6c6c0e018426d9c0530c08
Test: none
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 94b2eab..e70a993 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -21,9 +21,6 @@
         ]
     },
     {
-      "name": "StagedRollbackTest"
-    },
-    {
       "name": "CtsOsTestCases",
       "options": [
         {
@@ -50,6 +47,9 @@
   "presubmit-large": [
     {
       "name": "RollbackTest"
+    },
+    {
+      "name": "StagedRollbackTest"
     }
   ]
 }