Clean up return of `install_packages`
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Issue body
### What needs to get done
The `install_packages` method shouldn't return anything, as the information isn't used.
### Why it needs to get done
Spawned by the following TODO comment.
https://github.com/canonical/craft-parts/blob/70fc3bac64c17457fd90817fde749cfa8057cd78/craft_parts/packages/yum.py#L144
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