Delete profiles before deleting project

[dmjb]

This avoids an issue which Ozz ran into where the ON CASCADE DELETE relationships would attempt to delete rows from rule_type before deleting from rule_instances. This would fail because there is a foreign key relation from rule_instances to rule_type which prevents deletion of in-use rule types.

The old entity_profile_rules table had a foreign key reference to rule_type marked as ON DELETE CASCADE, and relied on logic in the code to prevent the deletion of rule instances which are in use.

Summary

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Fixes #(related issue)

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Review Checklist:

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

coverage: 53.132% (-0.005%) from 53.137%
when pulling 836440a on delete-profiles-first
into 75dcc45 on main.