Add support for the new `Create workflow dispatch event` response entries

Feature Request

See https://github.com/octokit/openapi-types.ts/issues/494 for the request to add the new workflow dispatch event syntax to the OpenAPI standard.

As a quick summary, "Create workflow dispatch event" API now returns the resulting run URL (HTML and API) and I would really like to be able to use that in a Probot app.

I am filing this in case there is any additional integration work needed to integrate with the solution once it is implemented there.