fix: address lint and mypy issues in api_core and kms

Author: hebaalazzeh

packages/google-api-core/google/api_core/gapic_v1/__init__.py

@@ -29,4 +29,3 @@
     "method_async",
     "routing_header",
 ]
-

packages/google-api-core/google/api_core/gapic_v1/client_helpers.py

@@ -110,15 +110,15 @@ def get_api_endpoint(
         Optional[str]: The API endpoint to be used by the client.
     """
     if api_override is not None:
-        api_endpoint = api_override
+        return api_override
     elif use_mtls_endpoint == "always" or (
         use_mtls_endpoint == "auto" and client_cert_source
     ):
         if universe_domain != default_universe:
             raise MutualTLSChannelError(
                 f"mTLS is not supported in any universe other than {default_universe}."
             )
-        api_endpoint = default_mtls_endpoint
+        return default_mtls_endpoint
     else:
-        api_endpoint = default_endpoint_template.format(UNIVERSE_DOMAIN=universe_domain)
-    return api_endpoint
+        return default_endpoint_template.format(UNIVERSE_DOMAIN=universe_domain)
+

packages/google-cloud-kms/google/cloud/kms_v1/services/key_management_service/client.py

@@ -171,9 +171,6 @@ def _use_client_cert_effective():
         """
         return gapic_v1.client_helpers.use_client_cert_effective()
 
-
-
-
     @classmethod
     def from_service_account_info(cls, info: dict, *args, **kwargs):
         """Creates an instance of this client using the provided credentials
@@ -579,9 +576,6 @@ def _get_api_endpoint(
             KeyManagementServiceClient._DEFAULT_ENDPOINT_TEMPLATE,
         )
 
-
-
-
     @staticmethod
     def _get_universe_domain(
         client_universe_domain: Optional[str], universe_domain_env: Optional[str]