Refactor TestEmitter and it doesn't need to be MainThreadInitializedObject

Bug: 361850561
Test: Presubmit
Flag: EXEMPT dagger

Change-Id: I30e7c3c165db698785e9e4d7e2256ab061ff71a2
diff --git a/tests/Android.bp b/tests/Android.bp
index 4bc654c..fc08e86 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -168,6 +168,7 @@
         "src/**/*Test.java",
         "src/**/*Test.kt",
         "src/**/RoboApiWrapper.kt",
+        "src/**/EventsRule.kt",
         "multivalentTests/src/**/*Test.java",
         "multivalentTests/src/**/*Test.kt",
     ],