Fix style

Author: HonahX

service/common/src/main/java/org/apache/polaris/service/catalog/policy/PolicyCatalogHandler.java

@@ -26,8 +26,6 @@
 import java.util.List;
 import org.apache.iceberg.catalog.Namespace;
 import org.apache.iceberg.catalog.TableIdentifier;
-import org.apache.iceberg.exceptions.NoSuchNamespaceException;
-import org.apache.iceberg.exceptions.NoSuchTableException;
 import org.apache.iceberg.exceptions.NotFoundException;
 import org.apache.polaris.core.auth.PolarisAuthorizableOperation;
 import org.apache.polaris.core.auth.PolarisAuthorizer;
@@ -45,7 +43,6 @@
 import org.apache.polaris.service.catalog.common.CatalogHandler;
 import org.apache.polaris.service.types.AttachPolicyRequest;
 import org.apache.polaris.service.types.CreatePolicyRequest;
-import org.apache.polaris.service.types.DetachPolicyRequest;
 import org.apache.polaris.service.types.GetApplicablePoliciesResponse;
 import org.apache.polaris.service.types.ListPoliciesResponse;
 import org.apache.polaris.service.types.LoadPolicyResponse;