Issue #3534056: Dispatch EmailValidationErrorEvent from the validator service

Max Pogonowskirequested to merge
issue/advanced_email_validation-3534056:3534056-email-validation-hook into 3.x
  • Add validateEmail() as the single public service method, returning an EmailValidationResult (error code + message).
  • Dispatch EmailValidationErrorEvent on a validation failure so other modules can react and optionally change the message; the single dispatch lives in the service, covering user account validation and the Webform handler.
  • Make validate() and errorMessageFromCode() private and drop them from the interface; the constraint validators and Webform handler call validateEmail().
  • Add EmailValidationResult and tests for the event and the result.

Closes #3534056

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