feat: admin pages for enterprise groups and enterprise group memberships #5531

Job	Run time
run_tests (3.8, quality)	2m 5s
run_tests (3.8, docs)	1m 41s
run_tests (3.8, django32-celery53)	7m 49s
run_tests (3.8, django42-celery53)	11m 22s
run_tests (3.8, django32-pii-annotations)	8m 2s
	30m 59s

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