Add the concept of "validation_mode" #1866

Job	Run time
Coding Standard	34s
Static analysis	28s
tests (8.0, 5.4.*, lowest, none)	34s
tests (8.0, 5.4.*, highest, none)	39s
tests (8.0, 6.0.*, lowest, none)	34s
tests (8.0, 6.0.*, highest, none)	37s
tests (8.1, 5.4.*, lowest, none)	24s
tests (8.1, 5.4.*, highest, none)	31s
tests (8.1, 6.0.*, lowest, none)	27s
tests (8.1, 6.0.*, highest, none)	32s
tests (8.1, 6.2.*, lowest, none)	30s
tests (8.1, 6.2.*, highest, none)	31s
tests (8.1, 6.4.*, lowest, none)	39s
tests (8.1, 6.4.*, highest, none)	43s
tests (8.2, 5.4.*, lowest, none)	29s
tests (8.2, 5.4.*, highest, none)	31s
tests (8.2, 6.0.*, lowest, none)	25s
tests (8.2, 6.0.*, highest, none)	35s
tests (8.2, 6.2.*, lowest, none)	32s
tests (8.2, 6.2.*, highest, none)	33s
tests (8.2, 6.4.*, lowest, none)	29s
tests (8.2, 6.4.*, highest, none)	39s
tests (8.2, 7.0.*, lowest, none)	40s
tests (8.2, 7.0.*, highest, none)	3m 1s
tests (8.3, 5.4.*, lowest, none)	24s
tests (8.3, 5.4.*, highest, none)	26s
tests (8.3, 6.0.*, lowest, none)	23s
tests (8.3, 6.0.*, highest, none)	28s
tests (8.3, 6.2.*, lowest, none)	27s
tests (8.3, 6.2.*, highest, none)	39s
tests (8.3, 6.4.*, lowest, none)	30s
tests (8.3, 6.4.*, highest, none)	30s
tests (8.3, 7.0.*, lowest, none)	28s
tests (8.3, 7.0.*, highest, none)	29s
tests (8.0, 5.4.*, lowest, --dev symfony/validator doctrine/orm doctrine/annotations)	57s
tests (8.1, 5.4.*, lowest, pcov)	47s
	22m 5s

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