This is consistent with the way we use separate actions to hide and
restore records, which is similar to enabling and disabling a record. We
might do something similar with the `toggle_selection` actions in the
future. For now, we're only doing it with budget phases because we're
going to add a similar switch control to hide and restore tenants.
We're also making these actions idempotent, so sending many requests to
the same action will get the same result, which wasn't the case with the
`toggle` action. Although it's a low probability case, the `toggle`
action could result in disabling a phase when trying to enable it if
someone else has enabled it between the time the page loaded and the
time the admin clicked on the "enable" button.
In the past it would have been confusing to add a way to directly
enable/disable a phase in the phases table because it was in the middle
of the form. So we would have had next to each other controls that don't
do anything until the form is sent and controls which modify the
database immediately. That's why we couldn't add the checkboxes we used
when using the wizard.
Now the phases aren't on the same page as the budget form, so we can
edit them independently. We're using a switch, so it's consistent with
the way we enable/disable features. We could have used checkboxes, but
with checkboxes, users expect they aren't changing anything until they
click on a button to send the form, so we'd have to add a button, and it
might be missed since we're going to add "buttons" for headings and
groups to this page which won't send a form but will be links.
Since we're changing the element with JavaScript after an AJAX call, we
need a way to find the button we're changing. The easiest way is adding
an ID attribute to all admin actions buttons/links.
