Display began_at/ended_at timestamps on notices

[SirRawlins]

At the moment we use the update.created_at timestamp next to comments, to show when they were posted. However, we don't include the actual began_at/ended_at timestamps.

This is particularly noticeable when historic incidents are added to the page, as their true start/end time isn't displayed, only the time the notice was added to the page.

[SirRawlins]

The first steps towards this were adding in 2.44.1 which just includes the began/ended timestamp alongside the duration in the "timeliness" section of the notice.

We'll next be looking at some style changes to updates to make the date/time they were posted less dominant.

[SirRawlins]

While doing some more QA I actually found a bug in that last PR, and 2.44.1 so have reverted the changes until I get time to properly address it. 2.44.2 is the latest stable release, and matches 2.44.0.