[UI] Don't show placement failures in UI if there currently aren't any

[rkettelerij]

Nomad version

Nomad v0.7.1

Issue

Once a placement failure has occurred the 'placement failure error' will always stay visible in the UI, regardless if subsequent runs of that job succeed. Expected behaviour: The placement failure error should only be visible if a job is currently in a failed stage.

Reproduction steps

• Start with a clean UI (e.g. purge all existing jobs nomad stop -purge myjob)
• Deploy a job and cause a placement issue
• Verify the placement issue is visible in the UI
• Fix the placement issue, for example by adjusting the job and rerunning it
• Expected behaviour: the previous placement failure isn't visible in the UI
• Actual behaviour: the placement failure is still there.

[DingoEatingFuzz]

Thanks for filing this @rkettelerij! It's fixed in #3956 and will be released in 0.8.0.

[github-actions]

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