CI: use "slow" marker for pytest (#30063)

* skip to mark

* fix quotes
old-commit-hash: 0251742079b206ce40a3b4d8ae9cec1381494d4a

selfdrive/locationd/test/test_laikad.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-import os
+import pytest
 import time
 import unittest
 from cereal import log
@@ -19,7 +19,6 @@ from openpilot.selfdrive.test.openpilotci import get_url
 from openpilot.tools.lib.logreader import LogReader
 
 from openpilot.selfdrive.test.process_replay.process_replay import get_process_config, replay_process
-from openpilot.selfdrive.test.helpers import SKIP_ENV_VAR
 
 GPS_TIME_PREDICTION_ORBITS_RUSSIAN_SRC = GPSTime.from_datetime(datetime(2022, month=1, day=29, hour=12))
 UBLOX_TEST_ROUTE = "4cf7a6ad03080c90|2021-09-29--13-46-36"
@@ -94,7 +93,7 @@ def get_measurement_mock(gpstime, sat_ephemeris):
   return meas
 
 
-@unittest.skipIf(SKIP_ENV_VAR in os.environ, f"Laika test skipped since it's long and not currently used. Unset {SKIP_ENV_VAR} to run")
+@pytest.mark.slow
 class TestLaikad(unittest.TestCase):
 
   @classmethod