Add data migration to associate modern language child subjects #2884

Job	Run time
build	1m 30s
build	1m 30s
Deploy to review environment	0s
Deploy to review environment	0s
Deploy to qa environment	2m 6s
Deploy to qa environment	1m 25s
Deploy to staging environment	1s
Deploy to staging environment	1m 37s
Deploy to sandbox environment	1s
Deploy to sandbox environment	2m 3s
Deploy to production environment	0s
Deploy to production environment	2m 53s
	13m 6s

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