Move TracingTests to presubmit

Change-Id: I62dd03e5a63ea5aecadfa6745e93d1de4a979764
Flag: TEST_ONLY
diff --git a/tests/Tracing/TEST_MAPPING b/tests/Tracing/TEST_MAPPING
index 7f58fce..f6e5221 100644
--- a/tests/Tracing/TEST_MAPPING
+++ b/tests/Tracing/TEST_MAPPING
@@ -1,5 +1,5 @@
 {
-  "postsubmit": [
+  "presubmit": [
     {
       "name": "TracingTests"
     }