Fix use of config file in vLLM pipelines

[wjayesh]

Describe changes

The current implementation of the vLLM integration takes in any system arguments and passes it to vLLM's internal arg parser functions, which specifically check for a --config in it and use the values there as arguments to the vllm serve, command.
This is unintended behavior and causes confusion. The change in this PR removes this condition and the right way to pass args to the vLLM serve function is to define those parameters in the VLLMServiceConfig class.

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
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