Add E2E vulkan-spirv codegen test for unidirectional_lstm.mlir.
Add E2E vulkan-spirv codegen test for unidirectional_lstm.mlir.

PiperOrigin-RevId: 288821248

google/iree,iree-org/iree,iree-org/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,google/iree,iree-org/iree,google/iree,google/iree