#### Describe the bug
With version 0.27.2 or older when reading the `response.headers['set-cookie']` it returned an array of cookies.
```
'set-cookie': [
    'something=else; path=/; expires=Wed, 12 Apr 2023 12:05:15 GMT; samesite=lax; secure; httponly',
    'something-ssr.sig=n4MlwVAaxQAxhbdJO5XbUpDw-lA; path=/; expires=Wed, 12 Apr 2023 12:05:15 GMT; samesite=lax; secure; httponly'
]
```

Since version 1.x when reading `response.headers.get('set-cookie')` it returns a string.
```
'set-cookie': 'something=else; path=/; expires=Wed, 12 Apr 2023 12:03:42 GMT; samesite=lax; secure; httponly,something-ssr.sig=n4MlwVAaxQAxhbdJO5XbUpDw-lA; path=/; expires=Wed, 12 Apr 2023 12:03:42 GMT; samesite=lax; secure; httponly'
```

This causes some problems when trying to append the set-cookie to another response.

#### To Reproduce
```js
response1.append('Set-Cookie', response2.headers.get('set-cookie'));
```

#### Expected behavior
AxiosHeaders.get('set-cookie') should return an array of cookies.

#### Environment
 - Axios Version 1.1.2
 - Node.js Version 16.17.0

#### Additional context/Screenshots
none

index.d.ts
NCELED";
  static readonly ECONNABORTED = "ECONNABORTED";
  static readonly ETIMEDOUT = "ETIMEDOUT";
}
export class CanceledError<T> extends AxiosError<T> {
}
export type AxiosPromise<T = any> = Promise<AxiosResponse<T>>;
export interface CancelStatic {
  new (message?: string): Cancel;
}
export interface Cancel {
  message: string | undefined;
}
export interface Canceler {
  (message?: string, config?: AxiosRequestConfig, request?: any): void;
}
export interface CancelTokenStatic {
  new (executor: (cancel: Canceler) => void): CancelToken;
  source(): CancelTokenSource;
}
export interface CancelToken {
  promise: Promise<Cancel>;
  reason?: Cancel;
  throwIfRequested(): void;
}
export interface CancelTokenSource {
  token: CancelToken;
  cancel: Canceler;
}
export interface AxiosInterceptorOptions {
  synchronous?: boolean;
  runWhen?: (config: AxiosRequestConfig) => boolean;
}
export interface AxiosInterceptorManager<V> {
  use(onFulfilled?: (value: V) => V | Promise<V>, onRejected?: (error: any) => any, options?: AxiosInterceptorOptions): number;
  eject(id: number): void;
  clear(): void;
}
export class Axios {
  constructor(config?: AxiosRequestConfig);
  defaults: AxiosDefaults;
  interceptors: {
    request: AxiosInterceptorManager<AxiosRequestConfig>;
    response: AxiosInterceptorManager<AxiosResponse>;
  };
  getUri(config?: AxiosRequestConfig): string;
  request<T = any, R = AxiosResponse<T>, D = any>(config: AxiosRequestConfig<D>): Promise<R>;
  get<T = any, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
  delete<T = any, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
  head<T = any, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
  options<T = any, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
  post<T = any, R = AxiosResponse<T>, D = any>(url: string, data?: D, config?: AxiosRequestConfi