SAK-22283; lessonbuilder implementation of link migration helper


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@121339 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAK-22283; fix LB implementation so it only gets called when the kernel supports it


git-svn-id: https://source.sakaiproject.org/svn/lessonbuilder/trunk@121340 66ffb92e-73f9-0310-93c1-f5514f145a0a