In pages specific to a service (e.g. dashboard and sub pages) the title
needs to distinguish which service it applies to. This is mainly to give
context to screen reader users who could be managing multiple services.
Implementing this uses template inheritance:
`page_title` includes `per_page_title` includes `service_page_title`
‘GOV.UK Notify’ is inserted into every page title.
Pages that set `service_page_title` get the service name inserted too.
We don't want large numbers in Production to start overlapping other columns
in the tables when they have less space available, and putting these messages
at the top of the page under the h1 means that we don't need an extra column
on the page yet.
This link looked odd floating above the left column, and although we may want
to have admin navigation on the left we aren't sure what that would include
yet, so move this link to the header alongside the Platform admin link.
When we make the numbers on this page more filterable the date range will be
one of the options to change, so it makes sense to move it to the side now
instead of leaving it above the big numbers.
This page currently includes all notifications for all services, including
those sent using a test key. Stats on all other pages exclude test key usage,
though, which can lead to confusion for admins comparing numbers between
pages. Adding the option to toggle between including and excluding test key
usage on the platform admin page gives context for this difference, and allows
admins to see live usage of the platform as well as load associated with test
key usage.
Since we’re going to have spearate tables for live and trial mode
services it saves copying and pasting to have a macro for them. Not
worth completely factoring out into a component because it’s only going
to be used on this page.
