[clang] Update expected test diagnostics to include matrices as accepted types

After #185304, some tests expect diagnostics that say that an argument "must be a scalar or vector of floating-point types". That message is now outdated for cases where matrices are also accepted, and should instead mention "scalar, vector, or matrix of floating-point types".

This affects not only the tests added in that PR, but also existing tests that rely on the older wording. Since the change in #185304 was made in the generic `SemaChecking.cpp` path rather than HLSL-specific code, the change affects not only HLSL tests that check the old diagnostic text.