fix: sync block structure cache before building navigation sidebar #49200

Job	Run time
lms-5(py=3.12,dj=pinned,mongo=7.0)	18m 48s
lms-4(py=3.12,dj=pinned,mongo=7.0)	20m 15s
lms-1(py=3.12,dj=pinned,mongo=7.0)	22m 11s
shared-with-lms-2(py=3.12,dj=pinned,mongo=7.0)	21m 14s
cms-2(py=3.12,dj=pinned,mongo=7.0)	19m 59s
collect-and-verify	3m 40s
shared-with-lms-1(py=3.12,dj=pinned,mongo=7.0)	22m 14s
lms-2(py=3.12,dj=pinned,mongo=7.0)	19m 12s
lms-3(py=3.12,dj=pinned,mongo=7.0)	19m 15s
cms-1(py=3.12,dj=pinned,mongo=7.0)	5m 6s
shared-with-cms-1(py=3.12,dj=pinned,mongo=7.0)	24m 12s
coverage (3.12)	1m 32s
Unit tests successful	3s
compile-warnings-report	2m 49s
merge-artifacts	29s
	3h 20m 59s

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