Page bundles should not be part of the publicly accessible
API and if we really need it, we can expose it and consume
internally. Hence, remove support for this transform from the
endpoint.
This patch falls back to the behavior before for backwards
compatibility before we fully switch over to using the transforms
in core. We still need to support both core & restbase for now.
NOTE: API integration tests have been updated to status code
404 since we're removing support for it now. If we need it,
we'll expose via a different endpoint and introduce tests.
Bug: T311477
Change-Id: I5577f61f7ae7da2a4d3a78d9ce962997466d550c
c1c5f3f7f3