[BUG] [VSCode Extension] Open LLM Tool doesn't allow specifying the 'stop' parameter when api is 'completion'

Assessment

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Description

Describe the bug
Open LLM Tool doesn't allow specifying the 'stop' parameter when api is 'completion' when api is 'completion'. This parameter is important when using the completion api to control when to stop generating tokens.

How To Reproduce the bug
Steps to reproduce the behavior, how frequent can you experience the bug:
Reproduced all the time.

The screenshot bellow shows that the 'stop' parameter cannot be set when using the 'completion' api.

Screenshots

1. On the VSCode primary side bar > the Prompt flow pane > quick access section. Find the "install dependencies" action. Please it and attach the screenshots there.

Environment Information

• Promptflow Package Version using pf -v: 1.6.0
• Operating System: 13.6.4 (22G513)
• Python Version using python --version: 3.11.8
• VS Code version.1.87.2
• Prompt Flow extension version. v1.14.0
• On the VS Code bottom pane > Output pivot > "prompt flow" channel, find the error message could be relevant to the issue and past them here. That would be helpful for our trouble shooting.
• If your code to repro the issue is public and you want to share us, please share the link.

Additional context
Add any other context about the problem here.

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