Revert "Add Firebase App Distribution to smoke tests (firebase#3555)" (firebase#3576)

This reverts commit 1667f33.

Author: rachaprince

smoke-tests/build.gradle

@@ -71,7 +71,6 @@ dependencies {
  // Firebase
  implementation "com.google.firebase:firebase-analytics"
  implementation "com.google.firebase:firebase-annotations"
- implementation "com.google.firebase:firebase-appdistribution"
  implementation "com.google.firebase:firebase-appindexing"
  implementation "com.google.firebase:firebase-auth"
  implementation "com.google.firebase:firebase-common"

smoke-tests/src/main/java/com/google/firebase/testing/BuildOnlyTest.java

@@ -21,7 +21,6 @@
 import com.google.firebase.messaging.FirebaseMessaging;
 import com.google.firebase.ml.modeldownloader.FirebaseModelDownloader;
 import com.google.firebase.perf.FirebasePerformance;
-import com.google.firebase.appdistribution.FirebaseAppDistribution;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -56,9 +55,4 @@ public void modelDownloader_IsNotNull() {
  public void performance_IsNotNull() {
  assertThat(FirebasePerformance.getInstance()).isNotNull();
  }
-
- @Test
- public void appDistribution_IsNotNull(){
- assertThat(FirebaseAppDistribution.getInstance()).isNotNull();
- }
 }