Description of problem:
Although user add anyone to excluded owners, getTasksAsiignedAsPotentialOwners() returns the excluded owner too because the excluded owner was a member of Potential Owners for the user task.

Steps to Reproduce:
1. Please check attached reproducer

Actual results:
getTasksAsiignedAsPotentialOwners() check potential owner list and return those, and not consider about excluded owners.

Expected results:
getTasksAsiignedAsPotentialOwners() will not return excluded owners for the user task