Add CtsTelecomTestCases to presubmit

Run CTS in presubmit for Telecom.

Add methods to clean up stuck calls and get rid of a potential NPE in
starting a mock emergency call.

Fixes: 158798240
Test: presubmit
Change-Id: Ibd8aa4a8131d00118077f63bd49e2286ae013af5
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 75feeb6..02bd056 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -15,6 +15,14 @@
           "exclude-annotation": "androidx.test.filters.FlakyTest"
         }
       ]
+    },
+    {
+      "name": "CtsTelecomTestCases",
+      "options": [
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        }
+      ]
     }
   ]
 }