Description of problem:

With MCN being GA in 4.19 with the completion of MCO-1720, the MCN presubmit e2e tests should be part of a blocking job. The tests were made blocking in 4.20 with MCO-1624 and this bug is being created to allow the backport of this work.

Version-Release number of selected component (if applicable):

4.19

How reproducible:

Always

Steps to Reproduce:

N/A

Actual results:

MCN presubmits are optional for 4.19 PRs.

Expected results:

MCN presubmits should be required for 4.19 PRs. 

Additional info:

N/A