feat: #3607135 Support for captcha element + requestValues on submitWebform

  • Expose the captchaType on WebformElementCaptcha
  • Introduce requestValues on submitWebform mutation to pass any additional request values for the submission. The captcha validators read the captcha response from request()->get(). The new requestValues argument allows for any additional values to be set (not just for captchas, but for other things as well)

Closes #3607135

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