S-51801: Rename Method to reflect new purpose, we only need to check to see if the AssignToUser is a user in the system.
S-51801: Rename Method to reflect new purpose, we only need to check to see
if the AssignToUser is a user in the system.

Bugzilla's API returns a 404 if you ask it's user endpoint for a user
that does not exist.

This enables us to check for a 200 (OK) status code and the code becomes
simpler than it was.

versionone/VersionOne.Integration.Bugzilla,versionone/VersionOne.Integration.Bugzilla,versionone/VersionOne.Integration.Bugzilla