Return error for invalid runtime datatypes

[fallintoplace]

Summary

• Return Status::kErrorInvalidProblem when runtime datatype A/B values are not found in the 3.x GEMM runtime datatype mapping.
• Apply the same validation to GEMM, blockwise GEMM, and sparse GEMM update paths.
• Avoid relying on assert("..."), which always evaluates true for string literals.

Testing

• git diff --check
• rg -n "assert\\(\\s*\\\"invalid runtime argument for datatype" tools/library/src/gemm_operation_3x.hpp tools/library/src/blockwise_gemm_operation_3x.hpp tools/library/src/sparse_gemm_operation_3x.hpp