Add GetByteSizeOverflow test for ValidateInputs overflow early-return path

[Copilot]

Adds test coverage for the GetByteSize(...) == OVERFLOW_SIZE early-return path introduced in infer_request.cc::ValidateInputs, which was previously untested.

Changes

• src/test/input_byte_size_test.cc — New GetByteSizeOverflow test in InputByteSizeTest:
  • Sets input shape {1, INT64_MAX/sizeof(float) + 1} on onnx_zero_1_float32: element count stays within int64_t range, but element_count * 4 overflows it
  • Provides a minimal 4-byte buffer — overflow is detected before the byte-size comparison, so no large allocation is required
  • Asserts TRITONSERVER_ServerInferAsync returns INVALID_ARG with the expected message substring

int64_t large_dim = static_cast<int64_t>(INT64_MAX / sizeof(float)) + 1;
std::vector<int64_t> shape{1, large_dim};  // GetByteSize overflows, GetElementCount does not

FAIL_TEST_IF_SUCCESS(
    TRITONSERVER_ServerInferAsync(server_, irequest_, nullptr),
    "expect error with byte size overflow",
    "' causes total byte size to exceed maximum size of ");

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