feat: [AXM-755] save external files and fonts to offline block content #787

Job	Run time
lms-1(py=3.11,dj=pinned,mongo=7.0)	13m 29s
collect-and-verify	4m 43s
lms-2(py=3.11,dj=pinned,mongo=7.0)	13m 19s
lms-3(py=3.11,dj=pinned,mongo=7.0)	19m 52s
lms-4(py=3.11,dj=pinned,mongo=7.0)	25m 13s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 16s
lms-6(py=3.11,dj=pinned,mongo=7.0)	19m 32s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	15m 46s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	18m 22s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	10m 57s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 41s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 27s
cms-2(py=3.11,dj=pinned,mongo=7.0)	19m 19s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	12m 13s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 8s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 3s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 14s
Unit tests successful	1s
coverage	0s
compile-warnings-report	6s
	3h 41m 41s

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