feat: allow blocks lower than units to be bookmarked #32483

Job	Run time
collect-and-verify	4m 12s
lms-1(py=3.11,dj=pinned,mongo=7.0)	10m 9s
lms-2(py=3.11,dj=pinned,mongo=7.0)	12m 41s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 6s
lms-4(py=3.11,dj=pinned,mongo=7.0)	19m 49s
lms-5(py=3.11,dj=pinned,mongo=7.0)	11m 25s
lms-6(py=3.11,dj=pinned,mongo=7.0)	16m 4s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 15s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 26s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 32s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 1s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 9s
cms-2(py=3.11,dj=pinned,mongo=7.0)	13m 47s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 48s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	5m 50s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 52s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	9m 11s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 23s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 50s
coverage (3.11)	1m 58s
compile-warnings-report	18s
Unit tests successful	25s
merge-artifacts	1m 7s
	3h 26m 18s

Provide feedback