PF extract inputs from outputs tests (#2225)

This adds adds missing test coverage for `ExtractInputsFromOutputs` for
various PF schemas. `ExtractInputsFromOutputs` is a shared function so
we should have coverage on both sides to make sure we don't cause
regressions when fixing one.

Similar to #2224
but on the PF side.

This is in preparation for
#2181 for
#2180.

Seeing some more evidence of
#2218 here.

Author: VenelinMartinov