Draft: Remove active scope call

What does this MR do and why?

From #360558 (closed)

The Schedulable concern has a flaw: it relies on an active scope that is defined by the concern = models using the concern are required to have an active scope. We not always have that.

This MR resolves this issue by removing the active scope call from app/models/concerns/schedulable.rb.

MR acceptance checklist

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Related to #360558 (closed)