V2 Library Imports: add v2 libs to list in _update_and_import_block

[connorhaugh]

If you want import to preserve student state w/ library content using v2 libraries, this check:

edx-platform/xmodule/modulestore/xml_importer.py

Line 881 in efaef45

if block.source_library_id and store.get_library(block.source_library_key):

needs to include v2 libs. Import with a v2 lib will break the importer atm i assume.

[kdmccormick]

Fixed by #33263