[Validator] Allow load mappings from attributes without doctrine/annotations #39032
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Follows #38309.
Currently, we cannot enable constraint mapping from attributes without having
doctrine/annotations
installed. Lifting that limitation is a bit tricky becauseValidatorBuilder::enableAnnotationMapping()
creates an annotation reader if you don't pass one. This PR aims at deprecating this behavior.I know it's a bit late for such a change in 5.2 and I should have seen earlier that this part was missing. 😓 Since I don't expect people to go all-in on attributes on day one, it's probably okay to postpone this change to 5.3.