[ResponseOps] More UX for rules where interval is less than configured minimum

[ymao1]

Followup to https://github.com/elastic/kibana/issues/126409

In this PR we added a flag indicator to the interval column when the rule interval is less than the configured minimum. If a user is able to edit rules, clicking on the flag will open the edit flyout. In addition when clicking into the rule details page, a toast pops up with an action button to open the edit flyout.

We also discussed showing a toast on the Rule Management list view that informs users that they have rules with intervals less that the configured minimum. Ideally we would add an action button to this toast that filters the rule list to just the rules with the small intervals. Since we don't have the ability to filter on rule intervals, we did not add this toast.

This issue is to support adding the toast. We would

• need to support filtering by rule interval on the rules list
• add toast that appears if user has any rules less than the configured minimum with an action button to filter the rules list to just those rules

Other ideas from @mdefazio

• Perhaps an icon on the interval column heading
• Maybe a tour component on the interval heading that we can then allow the user to dismiss and not show on every refresh.
• Provide sorting on this column

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)

[sophiec20]

With 8.2, we will now guide users who are creating new rules, not to set a small interval. This goal has been achieved. 👍

Extra toast messages would be targeted at users of alerting who a) have already created rules with a short interval before we gave warnings or b) intentionally want some shorter intervals for example to test. We already have a row indicator and in my opinion, this is sufficient as a reminder to correct these rules. Adding more complexity into the rules management page (such as toast, custom sorting or tours) does not have sufficient benefit at this time.