fix(spanner): unskip emulator tests for proto (#1145)

Author: harshachinta

tests/system/test_database_api.py

@@ -897,7 +897,6 @@ def _unit_of_work(transaction, test):
 
 
 def test_create_table_with_proto_columns(
- not_emulator,
  not_postgres,
  shared_instance,
  databases_to_delete,

tests/system/test_session_api.py

@@ -2649,7 +2649,7 @@ def test_execute_sql_w_query_param_struct(sessions_database, not_postgres):
 
 
 def test_execute_sql_w_proto_message_bindings(
- not_emulator, not_postgres, sessions_database, database_dialect
+ not_postgres, sessions_database, database_dialect
 ):
  singer_info = _sample_data.SINGER_INFO_1
  singer_info_bytes = base64.b64encode(singer_info.SerializeToString())