Use code generation for new files

What does this MR do and why?

Resolves #425445 (closed)

Adds a prompt to use code-bison for code generation in case the file is nearly empty or there is no instruction comment.

If we have code less than 5 lines then we consider it as a code generation intent. If the instruction is too small and code lines are < 5, then that is also a case for code generation.

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