Extend Danger bot to check scope definitions for database review

Abdul Wadoodrequested to merge
583046-danger-bot-scope-update into master

What does this MR do and why?

Update the BulkDatabaseActions danger plugin to detect ActiveRecord scope definitions in addition to bulk operations. Scopes can introduce performance issues when their query conditions change, so they should trigger the same database review prompt as bulk operations.

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Related to #583046 (closed)

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