Deps: Remove all unused android test dependencies from aztec

It is unclear why any 'androidTest' related dependency got
added to this module, as one can only navigate to this
(ad68cc9) commit and see that this was
done as part of the AndroidX migration, but, without any 'androidTest'
source set folder included on this module, nor any accompanying UI tests
added to it.

------------------------------------------------------------------------

This removal was suggested by the dependency analysis report, see below:

Advice for :aztec
Unused dependencies which should be removed:
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
  androidTestImplementation 'androidx.test.ext:junit:1.1.1'
  androidTestImplementation 'androidx.test:runner:1.2.0'
  ...

Dependencies which should be removed or changed to runtime-only:
  androidTestRuntimeOnly 'androidx.test:core:1.4.0'
   (was androidTestImplementation)
  ...

Author: ParaskP7

aztec/build.gradle

@@ -61,13 +61,6 @@ dependencies {
     testImplementation "org.robolectric:robolectric:$robolectricVersion"
     testImplementation 'androidx.test:core:1.4.0'
 
-    androidTestImplementation 'androidx.test:core:1.4.0'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0', {
-        exclude group: 'com.android.support', module: 'support-annotations'
-    }
-
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlinCoroutinesVersion"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlinCoroutinesVersion"