Remove default output axis values from fw_info.

[elad-c]

Pull Request Description:

Remove default output axis values from fw_info.

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• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
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• I have checked for code duplications.
• I have added new unittest (if necessary).

[reuvenperetz]

We will need to take care of pruning. It relies on the output channel axis to compute what percentage of each layer to remove (since the SIMD is included in this computation). Perhaps we can set a default and verify that the model architecture does not break this assumption in the pruning facade. If so, we can raise an error.