Set label to REQUIRED for descriptors with LEGACY_REQUIRED feature. #16308
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Ensures isOptional() does not return true for LEGACY_REQUIRED fields which would otherwise get the optional label applied by default (non-optional fields still get the optional label).
Adds validation to feature resolution instead of cross link, which is too early to have FieldPresence.LEGACY_REQUIRED resolved.
PiperOrigin-RevId: 618857590