Reform dynamique : ajoute la gestion de la condition `attached_to_institution` #424

Job	Run time
build (minimal, 3.9.9)	37s
build (minimal, 3.10.6)	41s
build (maximal, 3.9.9)	44s
build (maximal, 3.10.6)	46s
test-yaml (minimal)	2m 51s
test-yaml (maximal)	3m 0s
check-version-and-changelog	11s
check-for-functional-changes	0s
deploy	0s
	8m 50s

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