Investigate tox linting issues not being picked up in spread tests.
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Issue body
### What needs to get done
Ensure that linting issues from tox runs cause the `full-lifecycle` spread test to fail.
See: https://github.com/canonical/charmcraft/pull/1551/files#r1505197796
### Why it needs to get done
The templates should always generate code that pass linting and tests.
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