filter_push_down tests should not rely on TableProvider and ExecutionPlan

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
I would like to move the logical optimization rules to their own crate (#2599) and this
means that they should not depend on the physical plan.

filter_push_down tests currently rely on TableProvider and ExecutionPlan

Describe the solution you'd like
Remove the dependency and rewrite the tests to just use the logical plan

Describe alternatives you've considered
None

Additional context
None