BREAKING: remove `get_managed_cmd`
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Issue body
### What needs to get done
Delete this: https://github.com/canonical/craft-application/blob/149fb22dbcf454de1ea979fa93fe3e5e8aa56892/craft_application/commands/base.py#L112
### Why it needs to get done
This is a vestage of a previous design that was never used
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