[BUG][typescript-angular] interface generated for `anyOf` contains properties of all sub schemas

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

For a anyOf type the typescript-angular generator creates an interface that contains all properties from all sub-schemas listed. That is the same output as for allOf.
I'd expect to se a union type, it does not match the meaning of anyOf exactly but is good approximation.

Current Output:

export interface Bar { 
    prop1: number;
    prop2: string;
    prop3: string;
}

export interface Foo { 
    active?: boolean;
}

export interface FooBar { 
    active?: boolean;
    prop1: number;
    prop2: string;
    prop3: string;
}

export interface BarFoo { 
    active?: boolean;
    prop1: number;
    prop2: string;
    prop3: string;
}

Expected Output:

export interface Bar { 
    prop1: number;
    prop2: string;
    prop3: string;
}

export interface Foo { 
    active?: boolean;
}

export type FooBar = Foo | Bar;

export interface BarFoo { 
    active?: boolean;
    prop1: number;
    prop2: string;
    prop3: string;
}

openapi-generator version

6.3.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: anyOf issue
  version: 1.0.0
servers:
  - url: http://localhost:8080
components:
  schemas:
    Foo:
      type: object
      properties:
        active:
          type: boolean
    Bar:
      type: object
      required:
        - prop1
        - prop2
        - prop3
      properties:
        prop1:
          type: number
        prop2:
          type: string
        prop3:
          type: string

    FooBar:
      anyOf:
        - $ref: "#/components/schemas/Foo"
        - $ref: "#/components/schemas/Bar"
    BarFoo:
      allOf:
        - $ref: "#/components/schemas/Foo"
        - $ref: "#/components/schemas/Bar"

paths:
  /:
    get:
      summary: Create a new planning session
      operationId: getFooBar
      responses:
        "200":
          description: Return a Foo and/or Bar
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/FooBar"

Generation Details

openapi-generator-cli generate -i anyOf_issue.yaml -g typescript-angular -o anyOf_Issue

Steps to reproduce

1. Save provided spec as anyOf_issue.yaml
2. run code generation openapi-generator-cli generate -i anyOf_issue.yaml -g typescript-angular -o anyOf_Issue
3. Observe content of file anyOf_Issue/model/fooBar.ts

Related issues/PRs

There is an issue reporting an empty interface:
https://github.com/OpenAPITools/openapi-generator/issues/13428

Suggest a fix

Create a union type instead of an interface

Run the provided openapi-generator-cli command with the example specification, then inspect anyOf_Issue/model/fooBar.ts and compare it with the allOf-generated model. Trace the typescript-angular generation path responsible for anyOf models; done means FooBar is emitted as a union while BarFoo retains its combined interface properties.