Revert "Change POM group namespace to the testing namespace"

This reverts commit 32a17bf.

Author: vincetran

gradle.properties

@@ -14,7 +14,7 @@ org.gradle.parallel=true
 
 VERSION_NAME=2.27.4
 
-POM_GROUP=com.sonatype.central.testing.amazon
+POM_GROUP=com.amplifyframework
 POM_URL=https://github.com/aws-amplify/amplify-android
 POM_SCM_URL=https://github.com/aws-amplify/amplify-android
 POM_SCM_CONNECTION=scm:git:git://github.com/aws-amplify/amplify-android.git