ipatests: Bump PR-CI templates to Fedora 34
Move 'latest' to Fedora 34 and 'previous' Fedora 33 for nightly runs.
Keep gating on Fedora 33 for now.
Signed-off-by: Armando Neto <abiagion@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>