[AIRFLOW-6661] Fail after 50 failing tests (#7277)
[AIRFLOW-6661] Fail after 50 failing tests (#7277)

When we have a lot of failed tests due to environment problems the log of
failure is too long and gets truncated so that we do not see the root cause. We
should fail pytest after X failures (will try with x=50)

(cherry picked from commit 912b39d96580a6ed539e2e19ee8cd2282129afc8)

owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow,owlabs/incubator-airflow