Add test for dimensions unknown at compile time

Adds a test for operands which have one or more unknown dimensions at
compile time but are fully known at execution time. This is meant to be
supported but had a bug earlier.

Bug: 72448000
Test: NeuralNetworksTest_static (emulator)
Change-Id: I7ad5e6b6c29f8fe45098c9291d6a2d4b00c58eb8