[BUG] [Typescript-angular] Loses type information when having method that returns different schemas depending on accept-type

[HerrDerb]

Bug Report Checklist

• [x ] Have you provided a full/minimal spec to reproduce the issue?
• [x ] 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?
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Description

When having a definition for an endpoint that return different schemas, depending on the accept header, the typescript-angular generator library generates a method that does take either one of the accept headers but only return one type.

public getTenantHealth(tenantId: string, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/light+json' | 'application/json'}): Observable<TenantHealthLight>;

If application/json is defined as accept header, the method should return a TenantHealth

openapi-generator version

"@openapitools/openapi-generator-cli": "2.15.3"

OpenAPI declaration file content or url

---
openapi: 3.0.3
info:
  title: Reproducer
  description: Reproducer fro overloaeded get method
  version: unspecified
paths:
  /portal/tenant-health/{tenantId}:
    get:
      tags:
      - Tenant health Api
      summary: Get health status for a specific tenant
      description: Get Tenant Health
      operationId: getTenantHealth
      parameters:
      - name: tenantId
        in: path
        required: true
        schema:
          type: string
      responses:
        "200":
          description: OK
          content:
            application/light+json:
              schema:
                $ref: "#/components/schemas/TenantHealthLight"
            application/json:
              schema:
                $ref: "#/components/schemas/TenantHealth"
        "401":
          description: Not Authorized
        "403":
          description: Not Allowed
      security:
      - SecurityScheme: []
components:
  schemas:
    HealthStatus:
      enum:
      - UP
      - DOWN
      type: string
    TenantHealth:
      required:
      - tenant
      - status
      type: object
      properties:
        tenant:
          type: string
        status:
          $ref: "#/components/schemas/HealthStatus"
    TenantHealthLight:
      required:
      - tenant
      type: object
      properties:
        tenant:
          type: string
  securitySchemes:
    SecurityScheme:
      type: openIdConnect
      description: Authentication
      openIdConnectUrl: https://openId

Generation Details

openapi-generator-cli generate -i openapi/api.yaml -g typescript-angular -o generated-sources/openapi/api

Steps to reproduce

Simply generate

Suggest a fix

Generate a typescript method, for each acceptType/schema if there are multiple
E.g. for given spec:

public getTenantHealthTenantHealthLight(tenantId: string, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?: 'application/light+json'}): Observable<TenantHealthLight>;
public getTenantHealthTenantHealth(tenantId: string, observe?: 'body', reportProgress?: boolean, options?: {httpHeaderAccept?:  'application/json'}): Observable<TenantHealth>;