[BUG] GpuFilterExec reports incorrect nullability of output in some cases

[andygrove]

Describe the bug
GpuFilterExec contains code to look for IsNotNull predicates and uses that information to modify the output attributes to report that those attributes now have nullability=false. However, this code does not work because it is specifically looking for Spark case classes And (when extracting conjunctive predicates) and IsNotNull and does not recognize the GPU replacements for these expressions.

Steps/Code to reproduce bug
We have no easy way to reproduce this currently and I discovered the issue by chance with an intermittent failue in the TPC-H integration tests when AQE is enabled. I will write unit tests to reproduce it along with the fix.

Expected behavior
Output attributes should be reported with nullability = false if the filter had conjunctive predicates containing an IsNotNull expression for the output attribute.

Environment details (please complete the following information)
N/A

Additional context
N/A