Validate GatherBlockQuantized CUDA indices bounds (#31645)
This pull request adds validation for index ranges in the CUDA
implementation of the `GatherBlockQuantized` operator to prevent
out-of-bounds memory access. It also introduces new unit tests to ensure
the correctness of this validation, including cases with negative
indices. The most important changes are grouped below:
### CUDA Index Range Validation
* Added the `ValidateIndicesRangeForCuda` template function in
`gather_block_quantized.cc` to check that all indices are within the
valid range for the gather axis, supporting both CPU and CUDA memory.
This prevents invalid memory access during CUDA kernel execution.
* Integrated index validation into the
`GatherBlockQuantized::ComputeInternal` method, ensuring validation is
performed before computation proceeds.
### Unit Test Enhancements
* Added the `Test_NegativeInvalidIndices_WithZeroPoints` test helper to
cover cases with negative out-of-bounds indices.
* Introduced new CUDA-specific tests (`InvalidIndices_Cuda` and
`NegativeInvalidIndices_Cuda`) to verify that invalid indices (including
negative values) are correctly detected and handled on CUDA devices.
