Use rule_instances table in CountProfilesByEntityType query

[dmjb]

This further reduces our use of the entity_profiles table, which I am currently working towards removing.

New query evaluated by running it against both my local env and staging, and comparing to the result of the query it replaced. Note that it is only used for populating metrics.

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Fixes #(related issue)

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• Reviewed my own code for quality and clarity.
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[coveralls]

coverage: 53.655%. remained the same
when pulling b21fd6f on count-entity-type-metric
into a175dd9 on main.