Exclude transitive dependency on core for androidTest

androidTest of core already has the dependency on its main. Without this
exclude, gradle complains about type duplication when merging dex saying
"Type X is defined multiple times".

PiperOrigin-RevId: 302641585

library/core/build.gradle

@@ -61,7 +61,9 @@ dependencies {
     androidTestImplementation 'com.google.guava:guava:' + guavaVersion
     androidTestImplementation 'com.linkedin.dexmaker:dexmaker:' + dexmakerVersion
     androidTestImplementation 'com.linkedin.dexmaker:dexmaker-mockito:' + dexmakerVersion
-    androidTestImplementation project(modulePrefix + 'testutils')
+    androidTestImplementation(project(modulePrefix + 'testutils')) {
+        exclude module: gradle.ext.exoplayerModulePrefix + 'library-core'
+    }
     testImplementation 'com.google.guava:guava:' + guavaVersion
     testImplementation 'org.robolectric:robolectric:' + robolectricVersion
     testImplementation project(modulePrefix + 'testutils')