chore: don't stop inference and hide the stop button when creating a new thread

[louis-jan]

Describe Your Changes

This is to fix the issue where stop button is disabled when creating a new thread

Changes made

This pull request includes changes to the web/hooks/useCreateNewThread.ts file, focusing on code cleanup and removal of unused imports and variables. The most important changes include the removal of the useActiveModel import and associated variables and functions.

Code cleanup and simplification:

• Removed unused import useActiveModel from web/hooks/useCreateNewThread.ts.
• Removed the setIsGeneratingResponse variable and the stopInference function from the useCreateNewThread function in web/hooks/useCreateNewThread.ts.

[github-actions]

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