perf(grades): optimize database queries for large-scale grade recalcu… #49097

Job	Run time
collect-and-verify	3m 8s
shared-with-cms-1(py=3.12,dj=pinned,mongo=7.0)	23m 4s
lms-2(py=3.12,dj=pinned,mongo=7.0)	18m 46s
cms-1(py=3.12,dj=pinned,mongo=7.0)	5m 16s
cms-2(py=3.12,dj=pinned,mongo=7.0)	19m 41s
shared-with-lms-1(py=3.12,dj=pinned,mongo=7.0)	23m 6s
shared-with-lms-2(py=3.12,dj=pinned,mongo=7.0)	21m 9s
lms-4(py=3.12,dj=pinned,mongo=7.0)	20m 59s
lms-1(py=3.12,dj=pinned,mongo=7.0)	20m 50s
lms-3(py=3.12,dj=pinned,mongo=7.0)	18m 17s
lms-5(py=3.12,dj=pinned,mongo=7.0)	19m 24s
compile-warnings-report	2m 50s
Unit tests successful	2s
coverage (3.12)	1m 39s
merge-artifacts	32s
	3h 18m 43s

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