[ui] Pack metadata booleanified and added to the statuses endpoint

[philrenaud]

Context: Way back in Two-ought-twenty-two, we added a visual indicator for whether a job was run via Nomad Pack in the UI. We could do this because the /jobs endpoint returns job meta information, and pack consistently puts meta.pack.name etc. such that we can detect it.

With the purpose-built /statuses endpoint, we can be choosy about what we want to include and by default weren't delving into job metadata.

This PR checks to see if any of the tell-tale signs of pack are present, and if so, presents an isPack boolean to the endpoint that the UI turns into a little badge:

[github-actions[bot]]

Ember Test Audit comparison

	main	ed028f01894b4f0cf9d939bac3949d766fcdc29c	change
passes	1578	1578	0
failures	0	0	0
flaky	0	0	0
duration	11m 38s 003ms	11m 40s 569ms	+02s 566ms

[github-actions[bot]]

I'm going to lock this pull request because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active contributions. If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.