[functional][y] Change architecture checks with functionality of the #33388 to detect VNC installation
Outcome of discussion in the PR:
To enable yast2_vnc on s390x we checked for architecture, even though, it should be the same path for any remote VNC connection.
Not to forget where to apply the solution, we have this ticket.
- VNC based tests are detected in generic way and arch variable is not used in yast2_vnc