Fix several bugs/issues

[ido50]

The following bugs/issues are fixed:

• If an output path was not provided via --output-file, pressing "s" during the retry prompt would not result in a request to enter an output path, and the program would simply exit.

• When using ChatGPT's model, sometimes the model would "refuse" to generate code, perhaps due to misunderstanding the request. We (attempt) to prevent that by replacing "generate code" with "generate sample code" in the prompt prefix.

• The --model and --full flags would only be displayed for aiac get --help and not for aiac --help.

[ghost]

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