[Register Service] GCP Specific dependencies in register-test-core/pom.xml

GCP specific dependencies exist in the register-test-core/pom.xml:

 <dependency>
            <groupId>com.google.auth</groupId>
            <artifactId>google-auth-library-oauth2-http</artifactId>
            <version>0.15.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
           <groupId>com.google.guava</groupId>
           <artifactId>guava</artifactId>
           <version>27.1-jre</version>
       </dependency>
      <dependency>
           <groupId>org.opengroup.osdu</groupId>
           <artifactId>core-lib-gcp</artifactId>
           <version>0.1.21</version>
       </dependency>