fix: [AXM-791] fix error 404 handling and optimize for not modified b… #781

Job	Run time
lms-1(py=3.11,dj=pinned,mongo=7.0)	13m 32s
collect-and-verify	4m 56s
lms-2(py=3.11,dj=pinned,mongo=7.0)	13m 40s
lms-3(py=3.11,dj=pinned,mongo=7.0)	19m 28s
lms-4(py=3.11,dj=pinned,mongo=7.0)	25m 17s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 22s
lms-6(py=3.11,dj=pinned,mongo=7.0)	21m 9s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	15m 45s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	18m 41s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	10m 45s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 18s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 41s
cms-2(py=3.11,dj=pinned,mongo=7.0)	19m 25s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	12m 2s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 51s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 38s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 52s
compile-warnings-report	12s
Unit tests successful	4s
coverage	0s
	3h 43m 38s

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