IBX-8470: Upgraded codebase to Symfony 6 #278

Job	Run time
Integration tests (8.3, 7.7.3, dedicated)	2m 31s
Integration tests (8.3, 7.7.3, dedicated)	15m 43s
Integration tests (8.3, 7.7.3, shared)	12m 1s
Integration tests (8.3, 7.7.3, shared)	12m 1s
Integration tests (8.3, 7.7.3, single)	9m 49s
Integration tests (8.3, 7.7.3, single)	9m 49s
Integration tests (8.3, 7.7.3, cloud)	11m 49s
Integration tests (8.3, 7.7.3, cloud)	11m 49s
Integration tests (8.3, 8.11.2, dedicated)	13m 5s
Integration tests (8.3, 8.11.2, dedicated)	17m 12s
Integration tests (8.3, 8.11.2, shared)	15m 24s
Integration tests (8.3, 8.11.2, shared)	15m 24s
Integration tests (8.3, 8.11.2, single)	11m 28s
Integration tests (8.3, 8.11.2, single)	11m 28s
Integration tests (8.3, 8.11.2, cloud)	2m 34s
Integration tests (8.3, 8.11.2, cloud)	11m 33s
	3h 3m 40s

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