`charmcraft test` v4.0.1 lost `--list` support
Metadata
Current evaluation
No summary available.
Suggested action: —
No scores available.
Issue body
### Bug Description
Hi,
The `charmcraft test --list` used to work in charmcraft v3 and has lost `--list` in v4.0 ([here](https://github.com/canonical/charmcraft/pull/2385)).
It was a useful wrapper for users for `spread -list`. We used it in CI as well.
It would be nice to restore it. Tnx in advance!
P.S. references:
* https://github.com/jnsgruk/zinc-k8s-operator/pull/389/files
* https://matrix.to/#/!fcfzhmtmKApekMQcxX:ubuntu.com/$rQlo3T7B4KKbixL_WSmvYkaQnNQ3LuqQhQRJuDijmTM?via=ubuntu.com&via=matrix.org
* https://matrix.to/#/!fcfzhmtmKApekMQcxX:ubuntu.com/$-v1EvYDM_cs2pgxZ59AXzTaG1eLTtErCccl_SAZkuaY?via=ubuntu.com&via=matrix.org
### To Reproduce
```
> git clone https://github.com/canonical/postgresql-operator && cd postgresql-operator
> charmcraft test --list
Error: unrecognized arguments: --list
```
### Environment
```
> snap list charmcraft
Name Version Rev Tracking Publisher Notes
charmcraft 4.0.1 7517 latest/stable canonical✓ classic
```
### charmcraft.yaml
```yaml
https://github.com/canonical/postgresql-operator/blob/main/charmcraft.yaml
```
### Relevant log output
```shell
none
```
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| 2026-06-15 13:37:14.078362+00:00 | pending | — | — | — |