chore: delete unused requirements.txt file #30283

Job	Run time
collect-and-verify	4m 31s
lms-1(py=3.11,dj=pinned,mongo=7.0)	9m 51s
lms-2(py=3.11,dj=pinned,mongo=7.0)	11m 33s
lms-3(py=3.11,dj=pinned,mongo=7.0)	15m 13s
lms-4(py=3.11,dj=pinned,mongo=7.0)	19m 55s
lms-5(py=3.11,dj=pinned,mongo=7.0)	11m 37s
lms-6(py=3.11,dj=pinned,mongo=7.0)	14m 50s
openedx-1-with-lms(py=3.11,dj=pinned,mongo=7.0)	10m 53s
openedx-2-with-lms(py=3.11,dj=pinned,mongo=7.0)	14m 38s
openedx-1-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 38s
openedx-2-with-cms(py=3.11,dj=pinned,mongo=7.0)	6m 40s
cms-1(py=3.11,dj=pinned,mongo=7.0)	4m 36s
cms-2(py=3.11,dj=pinned,mongo=7.0)	12m 25s
common-with-lms(py=3.11,dj=pinned,mongo=7.0)	9m 43s
common-with-cms(py=3.11,dj=pinned,mongo=7.0)	5m 33s
xmodule-with-lms(py=3.11,dj=pinned,mongo=7.0)	8m 23s
xmodule-with-cms(py=3.11,dj=pinned,mongo=7.0)	8m 54s
compile-warnings-report	13s
Unit tests successful	5s
coverage (3.11)	1m 45s
merge-artifacts	7s
	3h 0m 3s

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