Add alert support and ops dashboard view of current enterprise license status and expiry.

[hcoyote]

with 24.3, we now get a metric to track when a commercial license is expiring so users can track and alert when that's getting close to end date.

on alerts, we should have an example that triggers an alert when date is within 30, 15, and 7 days (or some combination thereof)

on ops dashboard, add a widget that shows days to expiration or handle case when license is not added (which the metric emits as -1 at that point). In case of unlicensed, maybe show that enterprise license is not applied.