linting of TS-invalid repository name should raise error

We just had a case (repo name `apCLMS_to_RamClustR_converter`) where the CI passes [fine](https://github.com/RECETOX/galaxytools/runs/1549734848) but the toolshed upload [fails](https://github.com/RECETOX/galaxytools/runs/1552741248?check_suite_focus=true) (**silently**)

```
Unexpected HTTP status code: 400: {"err_msg": "Repository names must contain only lower-case letters, numbers and underscore.", "err_code": 400008}
```