feat: Add freeness condition and rename freeness labels

.vscode/settings.json

src/migrations/scripts/1730281269936-freeness-condition.ts

src/structures/dto/structure.dto.ts

src/structures/interfaces/structure-formatted.interface.ts

src/structures/schemas/structure.schema.ts

src/structures/services/structures-export.service.spec.ts

src/structures/services/structures-export.service.ts

src/structures/services/structures-import.service.ts

src/structures/services/structures.service.spec.ts

test/mock/data/gouvStructures.mock.data.ts

test/mock/data/structure.mock.dto.ts

test/mock/data/structures.mock.data.ts

test/mock/services/structures-export.mock.service.ts

test/mock/services/structures.mock.service.ts