🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

noxfile.py

@@ -238,8 +238,7 @@ def install_systemtest_dependencies(session, *constraints):
 
 
 @nox.session(python=SYSTEM_TEST_PYTHON_VERSIONS)
-@nox.parametrize("database_dialect", ["GOOGLE_STANDARD_SQL", "POSTGRESQL"])
-def system(session, database_dialect):
+def system(session):
     """Run the system test suite."""
     constraints_path = str(
         CURRENT_DIRECTORY / "testing" / f"constraints-{session.python}.txt"
@@ -257,9 +256,6 @@ def system(session, database_dialect):
         session.skip(
             "Credentials or emulator host must be set via environment variable"
         )
-    # If POSTGRESQL tests and Emulator, skip the tests
-    if os.environ.get("SPANNER_EMULATOR_HOST") and database_dialect == "POSTGRESQL":
-        session.skip("Postgresql is not supported by Emulator yet.")
 
     # Install pyopenssl for mTLS testing.
     if os.environ.get("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false") == "true":
@@ -281,10 +277,6 @@ def system(session, database_dialect):
             f"--junitxml=system_{session.python}_sponge_log.xml",
             system_test_path,
             *session.posargs,
-            env={
-                "SPANNER_DATABASE_DIALECT": database_dialect,
-                "SKIP_BACKUP_TESTS": "true",
-            },
         )
     if system_test_folder_exists:
         session.run(
@@ -293,10 +285,6 @@ def system(session, database_dialect):
             f"--junitxml=system_{session.python}_sponge_log.xml",
             system_test_folder_path,
             *session.posargs,
-            env={
-                "SPANNER_DATABASE_DIALECT": database_dialect,
-                "SKIP_BACKUP_TESTS": "true",
-            },
         )