Use associationless ManualRepository for #list
Use associationless ManualRepository for #list

Similar to the recent changes in OrganisationalManualServiceRegistry
(https://github.com/alphagov/specialist-publisher/commit/732dad056b351741c522e247af26b8449ff69ca0)
but since the current work (on GDS Editor permissions for Manuals) has involved
duplicating OrganisationalManualServiceRegistry's services in the vanilla
ManualServiceRegistry
(https://github.com/alphagov/specialist-publisher/commit/c6166ea6dc3228920b36c306d6ef86148dbd43a6)
we're now duplicating those recent OrganisationalManualServiceRegistry#list
changes in ManualServiceRegistry#list.

Background:

The associationless ManualRepository provides faster loading of Manuals when
none of their sections, etc are needed.

This associationless configuration of the ManualRepository isn't suitable for
general purpose use across the other services, since it doesn't fetch any of
a Manual's associated sections, etc, but none of that is needed when only
listing Manuals.

alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher,ministryofjustice/specialist-publisher,ministryofjustice/specialist-publisher,ministryofjustice/specialist-publisher,ministryofjustice/specialist-publisher,alphagov/manuals-publisher,alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher-rebuild,alphagov/manuals-publisher,alphagov/manuals-publisher,alphagov/specialist-publisher-rebuild