UI: Drop timezones from timestamps

[DingoEatingFuzz]

All timestamps are displayed in the user's local timezone. In a perfect world, the timezone abbreviations would also be shown to be extra clear. In that same perfect world, JavaScript has a reasonable Date lib.

[mitchellh]

Seems harmless. Looks good to me. Is this because the times are already localized or a UI thing?

[DingoEatingFuzz]

The timestamps we use in the UI are all nanos since epoch, therefore timezoneless, therefore localized when cast to a date.

There are some date fields in the API that use an ISO 8601 format which I assume include a timezone, so in the future we'll have to be careful about when and when not to mention a timezone in the UI.

Ideally we would also be consistent with date formats in the API, but nanoseconds make that weird.

[github-actions]

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