fix: remove learner_downloadable field references from libraries (#35… #795

Job	Run time
collect-and-verify	4m 9s
lms-1(py=3.11,dj=pinned,mongo=7.0)	9m 38s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 56s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 57s
lms-4(py=3.11,dj=pinned,mongo=7.0)	19m 57s
lms-5(py=3.11,dj=pinned,mongo=7.0)	13m 29s
lms-6(py=3.11,dj=pinned,mongo=7.0)	15m 58s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 6s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 36s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	10m 23s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 38s
cms-1(py=3.11,dj=pinned,mongo=7.0)	4m 31s
cms-2(py=3.11,dj=pinned,mongo=7.0)	13m 6s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	10m 20s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	5m 47s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 53s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 39s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 51s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 30s
Unit tests successful	4s
compile-warnings-report	8s
coverage	0s
merge-artifacts	6s
	3h 22m 42s

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