Issue #3534056: Deprecate validate() and errorMessageFromCode()

Max Pogonowskirequested to merge
issue/advanced_email_validation-3534056:3534056-deprecate-2x into 2.x
  • Mark AdvancedEmailValidatorInterface::validate() and errorMessageFromCode() as deprecated in advanced_email_validation:2.1.0, removed in 3.0.0; the 3.x service replaces them with a single validateEmail() method that returns an EmailValidationResult and dispatches a validation event.
  • Ignore the module's own internal calls to these methods in phpstan, since they remain the public API on this branch during the deprecation period.

Closes #3534056

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