Reform dynamique : ajoute la gestion de la condition `attached_to_institution` #418

Job	Run time
build (minimal, 3.9.9)	37s
build (minimal, 3.10.6)	40s
build (maximal, 3.9.9)	49s
build (maximal, 3.10.6)	42s
test-yaml (minimal)	2m 52s
test-yaml (maximal)	2m 50s
check-version-and-changelog	9s
check-for-functional-changes	0s
deploy	0s
	8m 39s

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