Remove unused code (#3326)

<!--
Thanks for opening a pull request!
-->

<!-- In the case this PR will resolve an issue, please replace
${GITHUB_ISSUE_ID} below with the actual Github issue id. -->
<!-- Closes #${GITHUB_ISSUE_ID} -->

# Rationale for this change

Remove unused code

## Are these changes tested?

N/A

## Are there any user-facing changes?

No

<!-- In the case of user-facing changes, please add the changelog label.
-->

Author: ebyhr

pyiceberg/catalog/bigquery_metastore.py

@@ -132,7 +132,6 @@ def create_table(
 
         dataset_name, table_name = self.identifier_to_database_and_table(identifier)
 
-        dataset_ref = DatasetReference(project=self.project_id, dataset_id=dataset_name)
         location = self._resolve_table_location(location, dataset_name, table_name)
         provider = load_location_provider(table_location=location, table_properties=properties)
         metadata_location = provider.new_table_metadata_file_location()
@@ -172,9 +171,7 @@ def create_namespace(self, namespace: str | Identifier, properties: Properties =
         try:
             dataset_ref = DatasetReference(project=self.project_id, dataset_id=database_name)
             dataset = Dataset(dataset_ref=dataset_ref)
-            dataset.external_catalog_dataset_options = self._create_external_catalog_dataset_options(
-                self._get_default_warehouse_location_for_dataset(database_name), properties, dataset_ref
-            )
+            dataset.external_catalog_dataset_options = self._create_external_catalog_dataset_options(properties, dataset_ref)
             self.client.create_dataset(dataset)
         except Conflict as e:
             raise NamespaceAlreadyExistsError("Namespace {database_name} already exists") from e
@@ -195,7 +192,6 @@ def load_table(self, identifier: str | Identifier) -> Table:
         Raises:
             NoSuchTableError: If a table with the name does not exist, or the identifier is invalid.
         """
-        database_name, table_name = self.identifier_to_database_and_table(identifier, NoSuchTableError)
         dataset_name, table_name = self.identifier_to_database_and_table(identifier, NoSuchTableError)
 
         try:
@@ -363,7 +359,7 @@ def _create_external_catalog_table_options(self, location: str, parameters: dict
         )
 
     def _create_external_catalog_dataset_options(
-        self, default_storage_location: str, metadataParameters: dict[str, Any], dataset_ref: DatasetReference
+        self, metadataParameters: dict[str, Any], dataset_ref: DatasetReference
     ) -> ExternalCatalogDatasetOptions:
         return ExternalCatalogDatasetOptions(
             default_storage_location_uri=self._get_default_warehouse_location_for_dataset(dataset_ref.dataset_id),