Add "canceled" build status

[gabalafou]

Description

This PR is the front-end companion to the following server PR:

• Add status CANCELED conda-store#747

This pull request:

• Adds "CANCELED" status to the front end
• Adds additional status to "Active" build if the build has ended but the status is not "COMPLETED"
  • Rationale: it was weird to me to see a canceled build marked "Active" in the dropdown. Yes, it is the current build, but it's broken and I think this should be a bit more obvious in the UI.

Screenshots

This screenshot shows how a canceled build appears in the UI. Note that this build is not the current build. The dropdown displays "October 22nd, 2024 - 6:19 PM - Canceled." And on the next line we have "Status: Canceled":

This screenshot shows how the current build appears in the dropdown if it was canceled. The line for this build in the dropdown displays "October 22nd, 2024 - 5:36 PM - Active - Canceled":

I want to be clear that I think that this UI is bad. The UI should draw a sharp visual distinction between failed versus successful builds. But the intent of this PR is not to fix the UI, but to at least make it more accurate by reporting a canceled build as canceled rather than "undefined", as Nikita reported.

Pull request checklist

• Did you test this change locally?
• [n/a] Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?