Enable aten.upsample_nearest2d.vec (#9067)

Summary:
As title, fix some edge cases and add two unit tests
```
buck test 'fbcode//mode/dev-nosan' fbcode//executorch/backends/qualcomm/tests/fb:test_qnn_delegate_simulator -- --exact 'executorch/backends/qualcomm/tests/fb:test_qnn_delegate_simulator - test_qnn_backend_up_sampling_nearest_2d_with_size (executorch.backends.qualcomm.tests.fb.test_qnn_delegate_simulator.TestQNNQuantizedOperatorSimulator)'
buck test 'fbcode//mode/dev-nosan' fbcode//executorch/backends/qualcomm/tests/fb:test_qnn_delegate_simulator -- --exact 'executorch/backends/qualcomm/tests/fb:test_qnn_delegate_simulator - test_qnn_backend_up_sampling_nearest_2d_with_size (executorch.backends.qualcomm.tests.fb.test_qnn_delegate_simulator.TestQNNFloatingPointOperatorSimulator)'
```

Differential Revision: D70796006