Add LANG LC_CTYPE LC_COLLATE explicitely at test run

Author: Oleg Gurev

testgres/plugins/pg_probackup2/pg_probackup2/init_helpers.py

@@ -57,7 +57,10 @@ def __init__(self):
         test_env = os.environ.copy()
         envs_list = [
             'LANGUAGE',
+            'LANG',
             'LC_ALL',
+            'LC_CTYPE',
+            'LC_COLLATE',
             'PGCONNECT_TIMEOUT',
             'PGDATA',
             'PGDATABASE',