fix(gapic): resolve linting errors from redundant eager imports

Author: hebaalazzeh

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

@@ -12,14 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from google.api_core.gapic_v1 import (
-    client_info,
-    config,
-    config_async,
-    method,
-    method_async,
-    routing_header,
-)
 import importlib.util
 from typing import Set