Build summary UI view

[hk-vmg]

What happened:
When a build completes (success or fail), it requires multiple clicks to find results.

For example, if a build fails, I go to the UI for my pipeline, then click the event, then click the failed build bubble, then hope that the last message in the highlighted step is a relevant error.

It is roughly possible to do this with event label, but that UI element does not wrap or hover, so only a very short string <18 chars is visible, and it's per event not per build.

What you expected to happen:
It would save a lot of time for users if template authors or pipeline authors could specify simple messages, or possibly more complex data, to be shown at a per-build level.

For example, one possibility would be a box shown when hovering over a green/red build bubble which displayed key/value data from a new sub-item from meta.
Another way to do this could be an extra box at the top of the build event page.

This box could be used to show things like:

• artifact version
• error message(s)
• links to relevant documentation or other related systems such as monitoring or the URL of a deployed artifact

It could be a generic place to include existing data like code coverage as well, so the UI does not need to get more cluttered.

In an ideal world, there could be a summary for either the build and/or the event.

How to reproduce it:

[tkyi]

Might be related to #2880