WIP: generateur multi stage done, il faut reprendre les tests, voir c… #3282

Job	Run time
build	47s
Linting: Standardjs	37s
Security: Brakeman	43s
Unit tests: RSpec	3m 45s
Linting: Rubocop	45s
Linting: YAML through prettier	43s
Integration tests: admin / Cucumber job	2m 22s
Integration tests: dgfip habilitations / Cucumber job	5m 6s
Integration tests: other habilitations / Cucumber job	4m 28s
Integration tests: others / Cucumber job	3m 25s
Merge develop with main	0s
Continuous deployment on staging	0s
	22m 41s

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