Harmonize CI & files #36

Job	Run time
Tests / Fetch supported versions	3s
Tests / Static analysis	32s
Tests / Up to date versions	7m 13s
Tests / Up to date versions - Special case - Symfony 5.4	6m 1s
Tests / Bare minimum	12s
Tests / Late migration - Symfony	3m 47s
Tests / Bare minimum - Special case - Symfony 5.4	17s
Tests / Late migration - PHP	21s
Tests / Nightly - PHP - With lowest supported Symfony versions	23s
Tests / Nightly - PHP - With highest supported Symfony versions	22s
Tests / Nightly - Symfony - With lowest supported PHP version	14s
Tests / Nightly - Symfony - With highest supported PHP version	10s
	19m 35s

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