ycb_django_pr15161

what a new run launched now would send

Use simplified paths for deconstruct of expressions
Description
	
Previously F() deconstructed to: django.db.models.expressions.F(). But since it can also be imported from django.db.models, ​PR #14047 changed it to deconstruct to django.db.models.F(). This simplifies generated migration code where it will be referenced only as from django.db import models / models.F().
As Mariusz pointed out on the PR, the same technique can be applied to other expressions, further simplifying generated migrations.

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