Fix depth check when adding existing epics
What does this MR do and why?
Issue: #387128 (closed)
Before this change, when adding an existing epic to the hierarchy, we did not calculate the right depth during validation and didn't allow creating hierarchies that are 7 levels deep.
For new epics it worked as we're not accounting for the Epic's hierarchy.
This off-by one error is now fixed as the new calculation uses 1
as
the minimum hierarchy.
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