The learning_sequences.use_for_outlines flag was recently added,
intended to serve the same purpose
as courseware.use_learning_seuqences_api. We do not need
both flags.
Furthermore, exposing either flag in the Courseware
Metadata API is neither necessary nor helpful, since
the easiest and quickest way for the Learning MFE to see
if the Learning Sequences API is enabled is to hit it,
and fall back to a different API if a 403 is returned.
This reverts commit 78f1e2b3bd.
TNL-8330
d86aa824c1