[Thread] graduate CtsThreadNetworkTestCases from postsubmit

Bug: 297729075
Test; build and pass the presubmit

Change-Id: Ie90fd5dfd1d77ed45b39c527d37954f5ff6facd8
diff --git a/thread/TEST_MAPPING b/thread/TEST_MAPPING
index 17a74f6..3eaebfa 100644
--- a/thread/TEST_MAPPING
+++ b/thread/TEST_MAPPING
@@ -1,7 +1,5 @@
 {
-  // TODO (b/297729075): graduate this test to presubmit once it meets the SLO requirements.
-  // See go/test-mapping-slo-guide
-  "postsubmit": [
+  "presubmit": [
     {
       "name": "CtsThreadNetworkTestCases"
     }