Calling `follow_redirect!` does not reset the `html_document`:

- When making a request to a controller that redirects, `follow_redirect!` would not reset the `html_document` ivar, it only resets the `html_document` ivar from the session (not the runner)
- If one was doing something like this;
  ```ruby
    get '/redirect'
    assert_select 'you are being redirected'
    follow_redirect!
    # html_document is memoized and doesn't get reset
  ```
- To fix the issue we can do the same for any other methods (`get`, `post`...) and define a method in the runner that delegates to the session but clears the html_document_first
- Fixes #29367

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