ipatests: add test_winsyncmigrate suite to nightly runs
The test suite test_winsyncmigrate was missing in nightly definitions
because CI was lacking configuration needed for establishing winsync
agreement: the Certificate Authority needs to be configured on
Windows AD instance. Now that PR-CI is updated to include said changes, we
can start executing this test suite. It is not reasonable to add it to
gating as this suite is time consuming just like other tests requiring
provisioning of AD instances.
Reviewed-By: Rob Crittenden <rcritten@redhat.com>