In this PR (https://github.com/consul/consul/pull/4683) a new syntax was introduced
in the component specs to check that the component was not rendering.
It seems interesting to add this syntax to the rest of the cases and thus unify the way
we check that a component is not rendering.
In component tests, the `within` method is actually an alias to RSpec's
`be_within` matcher, which is used to test numeric ranges. That meant
the tests always passed, even when there were bugs on the page.
In order to use `within` in component tests, we have to use
`page.within`. However, that also fails, since there's no such method
for `Capybara::Node::Simple'` objects, which are used in component
tests.
So we're using `page.find` instead.
See also pull request 945 in https://github.com/github/view_component
