refactor: switch from mock to unittest.mock #25668

Job	Run time
lms-1(py=3.11,dj=pinned,mongo=7.0)	13m 26s
lms-2(py=3.11,dj=pinned,mongo=7.0)	13m 32s
lms-3(py=3.11,dj=pinned,mongo=7.0)	19m 45s
lms-4(py=3.11,dj=pinned,mongo=7.0)	24m 4s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 45s
lms-6(py=3.11,dj=pinned,mongo=7.0)	18m 45s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	15m 36s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	18m 48s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	10m 39s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 32s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 23s
cms-2(py=3.11,dj=pinned,mongo=7.0)	19m 38s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 53s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 34s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 47s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 10s
coverage (3.11)	1m 45s
Unit tests successful	1s
compile-warnings-report	7s
	3h 36m 10s

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