chore: allow CI to run up to 3 hours
chore: allow CI to run up to 3 hours

because we now test agains all supported versions of DCOS-UI and cannot do that
in parallel due to our CI-machines not being very beefy (and thus cypress
crashing when starting more than 2-3 instances).

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui