private static boolean isInAutoValuePackage(String className) {
    return className.startsWith(AUTO_VALUE_PACKAGE_NAME) && !className.contains("Test");
  }
True if the given class name is in the com.google.auto.value package or a subpackage. False if
the class name contains {@code Test}, since many AutoValue tests under com.google.auto.value
define their own annotations.
value/src/main/java/com/google/auto/value/processor/AutoValueishProcessor.java