Remove duplicated constants

Author: martyngigg

elt-common/src/elt_common/dlt_destinations/pyiceberg/type_mapping.py

@@ -1,5 +1,3 @@
-from typing import Dict
-
 from elt_common.dlt_destinations.pyiceberg.helpers import (
     dlt_type_to_iceberg,
     iceberg_to_dlt_type,
@@ -12,10 +10,6 @@
 from dlt.destinations.type_mapping import TypeMapperImpl
 
 
-TIMESTAMP_PRECISION_TO_UNIT: Dict[int, str] = {0: "s", 3: "ms", 6: "us", 9: "ns"}
-UNIT_TO_TIMESTAMP_PRECISION: Dict[str, int] = {v: k for k, v in TIMESTAMP_PRECISION_TO_UNIT.items()}
-
-
 class PyIcebergTypeMapper(TypeMapperImpl):
     def to_destination_type(
         self, column: TColumnSchema, table: PreparedTableSchema