Craft parts swallows chisel errors if logging level is info or higher
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Issue body
### Bug Description
When installing a chisel slice, if it goes wrong the errors do not get bubbled up to the user.
### To Reproduce
Try running the part below
### part yaml
```shell
parts:
my-part:
plugin: nil
stage-packages: [this-is-not-a-real-package_slice]
```
### Relevant log output
```shell
[Does not contain chisel output, nor does the error message contain the chisel output]
```
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