Unable to enable spread verbose with `charmcraft test`
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Issue body
### Bug Description
#### Expected behavior
When running `charmcraft test`, it is possible to pass `-vv` to spread to always see output
> you'll see the output locally since the task failed (`-vv` to see the output nevertheless).
from https://github.com/canonical/spread?tab=readme-ov-file#hello-world
On GitHub Actions, spread is always run with a single job so we always want to see output of that job
#### Actual behavior
It is not possible to pass `-vv` to spread when using `charmcraft test`
### To Reproduce
```
charmcraft test 'github-ci:ubuntu-latest:tests/spread/test' -vv
charmcraft test -- 'github-ci:ubuntu-latest:tests/spread/test' -vv
charmcraft test 'github-ci:ubuntu-latest:tests/spread/test' -- -vv
```
### Environment
Ubuntu 24.04 github runner
### charmcraft.yaml
```yaml
N/A
```
### Relevant log output
```shell
N/A
```
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