[mlir][spirv] Disable wide bitwidth emulation in SPIR-V type converter #57917
Description
SPIR-V type converter will try to emulate bitwidths not supported by the target environment if emulateNon32BitScalarTypes is true, this includes both smaller bitwidths and larger ones. For smaller ones it's fine, but for larger ones the logic is just plainly truncate and that's problematic. Now with @kuhar's work on wide bitwidth emulation we should disable emulating larger bitwidths in SPIR-V type converter and fix/add tests. To be clear, we should also rename the option to emulateLT32BitScalarTypes or something.