Move CtsLibcoreOjTestCases 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
Test: none
Change-Id: Iae70a5b3e11c42ed35c50532fdb91552225f46fd
diff --git a/ojluni/src/main/java/java/time/TEST_MAPPING b/ojluni/src/main/java/java/time/TEST_MAPPING
index 5b24483..54d2ea6 100644
--- a/ojluni/src/main/java/java/time/TEST_MAPPING
+++ b/ojluni/src/main/java/java/time/TEST_MAPPING
@@ -7,7 +7,9 @@
           "include-filter": "libcore.java.time"
         }
       ]
-    },
+    }
+  ],
+  "presubmit-large": [
     {
       "name": "CtsLibcoreOjTestCases",
       "options": [
@@ -23,4 +25,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}