This commit is going to try using the `have_read_post` page object from
`topic_view` instead of the page object for `topic` because it's
implementation has a longer wait time as it uses the ENV variable for
wait time: `Capybara.default_max_wait_time * 2`.
If this works out we should probably remove the duplicated
`have_read_post` page object so that we have a single implementation.
acc87202b9