Exclude Assistant widget test

The "testAssistantWidget" test here:
https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:platform_testing/tests/automotive/functional/home/src/android/platform/tests/HomeTest.java;l=44 needs to be removed based on the `media_card_fullscreen` Flag. Since the test is in CatBox and flagging infrastructure is not supported there yet, the workaround is to exclude this test like in ag/26807253.

Bug: 331719655, 338476734
Test: atest --test-mapping
frameworks/base/packages/SystemUI:auto-end-to-end-postsubmit and make sure
testAssistantWidget test is not run.
Flag: NA

Change-Id: I5353f95e281fea76e276c988c6a8c8c7bae01c6b
diff --git a/packages/SystemUI/TEST_MAPPING b/packages/SystemUI/TEST_MAPPING
index 0c89a5d..deab818 100644
--- a/packages/SystemUI/TEST_MAPPING
+++ b/packages/SystemUI/TEST_MAPPING
@@ -59,13 +59,16 @@
       ]
     }
   ],
-  
+
   "auto-end-to-end-postsubmit": [
     {
       "name": "AndroidAutomotiveHomeTests",
       "options" : [
         {
           "include-filter": "android.platform.tests.HomeTest"
+        },
+        {
+          "exclude-filter": "android.platform.tests.HomeTest#testAssistantWidget"
         }
       ]
     },