Use ServicePrincipal implementation from os-core-lib-aws

provider/notification-aws/src/main/java/org/opengroup/osdu/notification/provider/aws/impl/ServiceAccountJwtAwsClientImpl.java

@@ -17,6 +17,7 @@ import lombok.AccessLevel;
 import lombok.Getter;
 import lombok.Setter;
 
+import org.opengroup.osdu.core.aws.entitlements.ServicePrincipal;
 import org.opengroup.osdu.core.common.util.IServiceAccountJwtClient;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Component;