`fetch-lib` should work from anywhere
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Issue body
### Bug Description
`charmcraft fetch-lib` used to work from any directory, now it complains there's no charmcraft.yaml
### To Reproduce
mkdir foo
cd foo
charmcraft fetch-lib charms.data_platform_libs.v0.s3
### Environment
tracking: latest/stable
refresh-date: 3 days ago, at 16:11 CEST
installed: 3.1.1 (4264)
Linux 6.5.0-41-generic #41~22.04.2-Ubuntu SMP PREEMPT_DYNAMIC Mon Jun 3 11:32:55 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
### charmcraft.yaml
```shell
n/a
```
### Relevant log output
```shell
Project file 'charmcraft.yaml' not found in 'REDACTED'.
Recommended resolution: Ensure the project file exists.
```
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