Move CtsTelecomTestCases 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: Ia1bd4bc56be291cc85291bfa334e4ecc85ecb11f
Test: none
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 02bd056..2e14650 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -15,7 +15,9 @@
           "exclude-annotation": "androidx.test.filters.FlakyTest"
         }
       ]
-    },
+    }
+  ],
+  "presubmit-large": [
     {
       "name": "CtsTelecomTestCases",
       "options": [