[depot] Show timestamp of package promotion somewhere on a packages page

[stevendanna]

When debugging build pipeline problems, it is common to check whether any essential build components have been recently updated. For Habtiat packages, the release timestamp for a given package identifies when a package was built but not when it was promoted into a given channel. The promotion information can be very useful for answering questions like "This package was built on the 31st, so why am I just seeing this problem now?"

[jeremymv2]

This card can track the Frontend UI work or the CLI work, but will need the endpoint to expose the audit data first.
The audit endpoint work for the Builder API is tracked in habitat-sh/builder#1360

[stale]

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