fix: remove instructor info serializer validation #25492

Job	Run time
lms-1(py=3.11,dj=pinned,mongo=7.0)	13m 23s
lms-2(py=3.11,dj=pinned,mongo=7.0)	12m 58s
lms-3(py=3.11,dj=pinned,mongo=7.0)	18m 56s
lms-4(py=3.11,dj=pinned,mongo=7.0)	23m 57s
lms-5(py=3.11,dj=pinned,mongo=7.0)	12m 28s
lms-6(py=3.11,dj=pinned,mongo=7.0)	18m 46s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	15m 53s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	18m 47s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	10m 47s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 29s
cms-1(py=3.11,dj=pinned,mongo=7.0)	5m 34s
cms-2(py=3.11,dj=pinned,mongo=7.0)	18m 45s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	11m 36s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 36s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	7m 44s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	7m 46s
coverage (3.11)	1m 41s
Unit tests successful	2s
compile-warnings-report	7s
	3h 33m 15s

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