It would be useful to be able to set `max_pending_time` per partition, not only [per test](https://reframe-hpc.readthedocs.io/en/stable/regression_test_api.html#reframe.core.pipeline.RegressionTest.max_pending_time). It could be solved if https://github.com/reframe-hpc/reframe/issues/1500 is implemented.
