Apply Shane's review: imported rules, state filter, and corrections

[CandiceChislett]

Adds an Imported Rules page, from Shane's write-up. Rules carried over from FusionReactor Alerts keep their original format, with the condition inside the query rather than in a Threshold step, and a prometheus_math Math step between Query and Threshold. The page covers recognizing one, why the chart draws a threshold of 0, the imported vs standard comparison, how to update one, and the two edge cases that change afterwards. Linked from the Alerting overview and Alert Rules.

Corrections from the same review:

• The state filter starts on Firing, Error, Pending and Recovering, so healthy rules are not listed by name until it is widened. A card's chips count everything it holds regardless of the filter, which is why a card can read Normal 11 while listing one Pending rule. The Status page previously described this as promotion rather than filtering
• Recovering no longer refers to a Keep firing for period, and the flapping fix that recommended that field is removed. The field was never added to the rule form
• The expanded rule view shows Namespace, not Data source
• Updating an imported rule on a duplicate is a recommendation rather than the procedure
• Contact points gain a note on OpsGenie's removal, pointing at Jira Service Management and Atlassian's migration guide

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