Move InputMethodStressTest to postsubmit

Test: atest InputMethodStressTest
Bug: 288478487
Change-Id: I3f68dcf98f0348dee9c426413b2ee628ddd01e9a
diff --git a/tests/InputMethodStressTest/TEST_MAPPING b/tests/InputMethodStressTest/TEST_MAPPING
index 06e2ce8..d982dd8 100644
--- a/tests/InputMethodStressTest/TEST_MAPPING
+++ b/tests/InputMethodStressTest/TEST_MAPPING
@@ -1,5 +1,5 @@
 {
-  "presubmit-large": [
+  "postsubmit": [
     {
       "name": "InputMethodStressTest"
     }