Backport "Filter out incomplete publications from the pulp2repositories view" to 0.11
CLOSED - CURRENTRELEASE
If the only publication a repo version has is incomplete, it would be shown in a mapping as migrated.
The problematic code: https://github.com/pulp/pulp-2to3-migration/blob/master/pulp_2to3_migration/app/serializers.py#L236
Show only complete publications at pulp2repositories endpoint
backports #9242 https://pulp.plan.io/issues/9242
(cherry picked from commit 09e5f45a246682781571ad56d1e759eefaac22b3)