feat: make course -> lib import synchronous #21591

Job	Run time
python-3.8,django-pinned,lms-1	10m 24s
python-3.8,django-pinned,lms-2	9m 51s
python-3.8,django-pinned,lms-3	15m 53s
python-3.8,django-pinned,lms-4	18m 53s
python-3.8,django-pinned,lms-5	9m 20s
python-3.8,django-pinned,lms-6	15m 25s
python-3.8,django-pinned,openedx-1-with-lms	12m 44s
python-3.8,django-pinned,openedx-2-with-lms	14m 43s
python-3.8,django-pinned,openedx-1-with-cms	7m 24s
python-3.8,django-pinned,openedx-2-with-cms	4m 21s
python-3.8,django-pinned,cms-1	2m 41s
python-3.8,django-pinned,cms-2	15m 11s
python-3.8,django-pinned,common-with-lms	8m 51s
python-3.8,django-pinned,common-with-cms	4m 16s
python-3.8,django-pinned,xmodule-with-lms	5m 1s
python-3.8,django-pinned,xmodule-with-cms	5m 8s
python-3.8,django-4.2,lms-1	11m 18s
python-3.8,django-4.2,lms-2	10m 1s
python-3.8,django-4.2,lms-3	16m 26s
python-3.8,django-4.2,lms-4	19m 16s
python-3.8,django-4.2,lms-5	9m 8s
python-3.8,django-4.2,lms-6	15m 49s
python-3.8,django-4.2,openedx-1-with-lms	12m 44s
python-3.8,django-4.2,openedx-2-with-lms	14m 51s
python-3.8,django-4.2,openedx-1-with-cms	7m 12s
python-3.8,django-4.2,openedx-2-with-cms	4m 35s
python-3.8,django-4.2,cms-1	3m 0s
python-3.8,django-4.2,cms-2	15m 41s
python-3.8,django-4.2,common-with-lms	8m 54s
python-3.8,django-4.2,common-with-cms	4m 24s
python-3.8,django-4.2,xmodule-with-lms	5m 13s
python-3.8,django-4.2,xmodule-with-cms	5m 2s
Unit tests successful	4s
coverage (3.8)	1m 45s
compile-warnings-report	9s
	5h 25m 38s

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