Fix GatherND error tests: register CPU provider explicitly using GTEST_SKIP

Author: chaya2350

onnxruntime/test/providers/cpu/tensor/gather_nd_op_test.cc

@@ -339,6 +339,9 @@ TEST(GatherNDOpTest, GatherND_batch_dims_mismatch_error) {
   test.AddInput<int64_t>("indices", {2, 1}, {1, 2});
   test.AddOutput<float>("output", {2}, {0.f, 0.f});  // dummy output, won't be used
   test.ConfigEp(DefaultCpuExecutionProvider());
+  if (!DefaultCpuExecutionProvider()) {
+    GTEST_SKIP() << "Test only valid for CPU EP";
+  }
   test.Run(OpTester::ExpectResult::kExpectFailure,
            "GatherND: indices batch size (2) is not divisible by input batch size (3)");
 }
@@ -352,6 +355,9 @@ TEST(GatherNDOpTest, GatherND_zero_batch_dims_error) {
   test.AddInput<int64_t>("indices", {2, 1}, {1, 2});
   test.AddOutput<float>("output", {2}, {0.f, 0.f});  // dummy output, won't be used
   test.ConfigEp(DefaultCpuExecutionProvider());
+  if (!DefaultCpuExecutionProvider()) {
+    GTEST_SKIP() << "Test only valid for CPU EP";
+  }
   test.Run(OpTester::ExpectResult::kExpectFailure,
            "GatherND: input tensor batch dimensions cannot be zero");
 }