We were repeating the same code over and over (with a few variants) to
setup tests which require an administrator. We can use a tag and
simplify the code.
This rule was added in Rubocop 0.89.0. However, there are some false
positives when we don't use interpolation but simply concatenate in
order to avoid long lines. Even if there weren't false positives, there
are places where we concatenate to emphasize the point that we're adding
a certain character to a text.
We might reconsider this rule in the future, since we generally prefer
interpolation over concatenation.
In this case the confirmation dialog isn't really necessary since the
action to enable/disable the setting can easily be undone.
Furthermore, these tests were failing with Chrome 83, probably because
we use `confirm_dialog` and then we use `visit` without checking the
page in between.
In theory we shouldn't need to check the page in between because the
request generated by `confirm_dialog` is a synchronous one and so
`visit` isn't executed after the previous request has finished, but
apparently this behavior has changed in Chrome 83.
We could add an expectation before executing the `visit` method, but
that wouldn't improve the usability of the application.
