Variable LABEL_TYPES`Const`

LABEL_TYPES: readonly [
    "text",
    "textarea",
    "number",
    "boolean",
    "select",
    "date",
    "datetime",
    "time",
    "url",
    "email",
    "phone",
    "color",
]

Every label type a promoted attribute definition may declare, in the order they are offered to the user. This is the runtime source of truth: LabelType is derived from it, so a new type cannot be added to the union without parse also accepting it.