Issue #3367302: Convert allowed field label option values to constants

Ajinkya Walunjrequested to merge
issue/drupal-3367302:3367302-make-the-allowed into 11.x
  • Moved allowed values for field label options to constants inside FieldLabelOptionsTrait.
  • This avoids hardcoded "magic keys" and makes it easier to reuse or change these values.
  • No functional changes.

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