[Bug] TVM failes to compile onnx model: TVMError: CodeGenVM cannot handle this intrinsic now: Op(relax.concat)

### Expected behavior

TVM should build the model correctly.

### Actual behavior

When compiling the model, TVM crashes as follows:


```c
Traceback (most recent call last):
File "/home/carla/Documents/test/test.py", line 189, in
main()
File "/home/carla/Documents/test/test.py", line 178, in main
check_correctness(onnx_model)
File "/home/carla/Documents/test/test.py", line 126, in check_correctness
ex = relax.build(tvm_model, target="llvm", relax_pipeline=relax_pipeline)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/carla/Documents/tvm/python/tvm/relax/vm_build.py", line 258, in build
mod = _vmcodegen(builder, mod, exec_mode)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/carla/Documents/tvm/python/tvm/relax/vm_build.py", line 77, in _vmcodegen
return _ffi_api.VMCodeGen(builder, mod) # type:ignore
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "tvm/_ffi/_cython/./packed_func.pxi", line 339, in tvm._ffi._cy3.core.PackedFuncBase.__call__
File "tvm/_ffi/_cython/./packed_func.pxi", line 270, in tvm._ffi._cy3.core.FuncCall
File "tvm/_ffi/_cython/./packed_func.pxi", line 259, in tvm._ffi._cy3.core.FuncCall3
File "tvm/_ffi/_cython/./base.pxi", line 185, in tvm._ffi._cy3.core.CHECK_CALL
File "/home/carla/Documents/tvm/python/tvm/_ffi/base.py", line 468, in raise_last_ffi_error
raise py_err
tvm._ffi.base.TVMError: Traceback (most recent call last):
7: tvm::runtime::PackedFuncObj::Extractor::AssignTypedLambda(tvm::IRModule (*)(tvm::relax::ExecBuilder, tvm::IRModule), std::__cxx11::basic_string, std::allocator >)::{lambda(tvm::runtime::TVMArgs const&, tvm::runtime::TVMRetValue*)#1}> >::Call(tvm::runtime::PackedFuncObj const*, tvm::runtime::TVMArgs, tvm::runtime::TVMRetValue*)
6: tvm::relax::relax_vm::VMCodeGen(tvm::relax::ExecBuilder, tvm::IRModule)
5: tvm::relax::relax_vm::CodeGenVM::Run(tvm::relax::ExecBuilder, tvm::IRModule)
4: tvm::relax::relax_vm::CodeGenVM::Codegen(tvm::relax::Function const&)
3: tvm::relax::ExprFunctor::VisitExpr(tvm::RelaxExpr const&)
2: tvm::relax::relax_vm::CodeGenVM::VisitExpr_(tvm::relax::SeqExprNode const*)
1: tvm::relax::ExprFunctor::VisitExpr(tvm::RelaxExpr const&)
0: tvm::relax::relax_vm::CodeGenVM::VisitExpr_(tvm::relax::CallNode const*)
File "/home/carla/Documents/tvm/src/relax/backend/vm/codegen_vm.cc", line 156
TVMError: CodeGenVM cannot handle this intrinsic now:
Op(relax.concat)
```

### Environment

OS: Ubuntu 20.04
TVM: 0.21.dev0(c00f52a70)

### Steps to reproduce

This bug can be reproduced by the following code with the model in the attachment. As shown in the code, the model can be executed by onnxruntime, which indicates that this is a valid model. It is strange that CodeGenVM cannot handle the concat operator.

```python
import sys

import numpy as np
import onnx
import onnxruntime

import tvm
from tvm import relax
from tvm.relax.frontend.onnx import from_onnx

import pickle

def main():
onnx_model = onnx.load("a317.onnx")

with open("inputs.pkl", "rb") as fp:
inputs = pickle.load(fp)

try:
ort_session = onnxruntime.InferenceSession(
onnx_model.SerializeToString(), providers=["CPUExecutionProvider"]
)
ort_output = ort_session.run([], inputs)
except Exception as e:
print(e)
sys.exit(1)

tvm_model = from_onnx(onnx_model, keep_params_in_input=True)
tvm_model = relax.transform.DecomposeOpsForInference()(tvm_model)
tvm_model = relax.transform.LegalizeOps()(tvm_model)

tvm_model, params = relax.frontend.detach_params(tvm_model)

with tvm.transform.PassContext(opt_level=0):

ex = relax.build(tvm_model, target="llvm")

if __name__ == "__main__":
main()
```

[testcase.zip](https://github.com/user-attachments/files/19830818/testcase.zip)

### Triage

* needs-triage

Start with src/relax/backend/vm/codegen_vm.cc at line 156 and reproduce the failure using the attached testcase and the provided Python script. Trace how CodeGenVM visits relax.concat, then run the reproduction and relevant Relax tests to verify that compiling the ONNX model no longer raises the unsupported-intrinsic error.

Written by the indexing model from the issue text.