AA/CJA: add information about when alert was last triggered to alert manager

[#1]

Description

Alerts are a popular way to notify users that an anomaly or data issue has occurred. The alerts manager page allows users (and admins) to view which alerts have been created, including the expiration date and date modified, but does not show when the alert was last triggered or how many times it was triggered over the last 30 days.

Why is this feature important to you

Knowing how often an alert was triggered can let users (and admins) know if alerts are still useful, whether alerts may need definition changes, or whether an alert is happening so often that an underlying issue should be prioritized.

How would you like the feature to work

Add a column for "Last Triggered" that will show the date-time for the last run (e.g. May 14, 2025 3:17 PM). Also, add a column showing the number of times the alert was triggered within the last 30 days. These columns could be toggled on/off.

Current Behavior

No information about when an alert was last triggered or how often it was triggered is available in the alert manager or the edit alert pages.