errorMessage is not considered if rule message/description is provided

[johannesmarx]

Describe the bug
In case the built-in schema function is used for validation and custom errorMessages are provided (including the configuration allErrors: true), the messages only show up if neither message or description of the rule is provided.

To Reproduce

1. Given this OpenAPI document spec.yaml

openapi: 3.0.3
info:
  title: Test
  version: 1.0.0
  contact: 
    name: Contact
  description: Some API
servers:
  - url: https://example.com/v1
tags:
  - name: tag
paths:
  /:
    get:
      description: Operation
      operationId: operationId
      tags:
        - tag
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Response'
components:
  schemas:
    Response:
      type: object
      properties:
        special_property:
          type: integer
          maxLength: 2

and the rules file .spectral.yaml

extends: ["spectral:oas"]

rules:
  must-use-valid-special-property:
    message: Must use special property definition
    description: Checks for special property definition
    severity: error
    given: 
      - $..special_property
    then:
    - function: schema
      functionOptions:
        schema:
          type: object
          properties:
            type:
              type: string
              const: string
              errorMessage: "\"type\" property must be equal to `\"string\"` instead of `${0}`."
            maxLength:
              type: integer
              const: 3
              errorMessage: "\"maxLength\" of special property must be set to `3` instead of `${0}`."
          required: [type, maxLength]
        allErrors: true

3. Run this CLI command npx spectral lint -r .spectral.yaml spec.yaml
4. See the output

spec.yaml
 32:17  error  must-use-valid-special-property  Must use special property definition  components.schemas.Response.properties.special_property.type
 33:22  error  must-use-valid-special-property  Must use special property definition  components.schemas.Response.properties.special_property.maxLength

Expected behavior

As individual errorMessages are provided and the option allErrors: true is set, I'd expect to receive the following instead:

spec.yaml
 32:17  error  must-use-valid-special-property  "type" property must be equal to `"string"` instead of `"integer"`.  components.schemas.Response.properties.special_property.type
 33:22  error  must-use-valid-special-property  "maxLength" of special property must be set to `3` instead of `2`.   components.schemas.Response.properties.special_property.maxLength

In case I comment message: Must use special property definition the description text is shown instead which also doesn't meet my expectations.
Only if both message and description properties of the rule are not set I'm getting the expected behavior.

Environment (remove any that are not applicable):

• npx spectral --version
  6.14.2