fix(metric_alerts): Fix issue with manually resolved alerts not showing the resolved marker. (#19653)
fix(metric_alerts): Fix issue with manually resolved alerts not showing the resolved marker. (#19653)

Since the manual resolved date includes seconds it doesn't correctly align to a bucket, and so is
not shown on the graph. We don't care about second granularity, so just remove them when returning
this date.
beeftornado/sentry,beeftornado/sentry,beeftornado/sentry