Remove unused parameter in csharp InferenceTest (#24031)
### Description
Fix a warning from analyzers:
```
Theory method 'CanRunInferenceOnAModelDotnetTensors' on test class 'InferenceTest' does not use parameter 'enableParallelExecution'. Use the parameter, or remove the parameter and associated data. (https://xunit.net/xunit.analyzers/rules/xUnit1026
```
### Motivation and Context
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- If it fixes an open issue, please link to the issue here. -->
