Enum value deletion/update is not detected as a breaking change by check-breaking

[blva]

Describe the bug

Previously, the breaking-only flag would detect any enum value deletion as a breaking change, which makes sense as this can cause customer's automation to break if they rely on an enum value in a request. -check-breaking does not classisfy that as a breaking change. We'd like to either have the check under -check-breaking or have it as a custom check.

To Reproduce
Steps to reproduce the behavior:

1. Run oasdiff -base base.yaml -revision revision.yaml -check-breaking
2. With base.yaml

openapi: 3.0.1
info:
  title: Test API
tags:
- name: Tests
  description: Test tag.
paths:
  /api/deleteEnumTest:
    get:
      tags:
      - Tests
      summary: This is a test
      description: Test description.
      operationId: getTest
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: string
                description: Enum values
                enum:
                - VALUE_1
                - VALUE_2
                - VALUE_3

3. With revision.yaml

openapi: 3.0.1
info:
  title: Test API
tags:
- name: Tests
  description: Test tag.
paths:
  /api/deleteEnumTest:
    get:
      tags:
      - Tests
      summary: This is a test
      description: Test description.
      operationId: getTest
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: string
                description: Enum values
                enum:
                - VALUE_1
                - VALUE_2
                - VALUE_5

5. Recieve

Expected behavior
Similar to -breaking-only

paths:
    modified:
        /api/atlas/v2/deleteEnumTest:
            operations:
                modified:
                    GET:
                        responses:
                            modified:
                                "200":
                                    content:
                                        mediaTypeModified:
                                            application/json:
                                                schema:
                                                    enum:
                                                        deleted:
                                                            - VALUE_3
endpoints:

Desktop (please complete the following information):

• OS: Mac OS Monterey

[reuvenharrison]

Removing an enum value in a response in not considered breaking.