Improve the everyvoice check-data help

[joanise]

Bug description

everyvoice -h includes this:

## Check Data

    You can optionally check your data by running everyvoice check-data [OPTIONS]

But the command is declared as hidden

@app.command(hidden=True)
def check_data(

and the help is not really sufficient to know what to do with it:

$ everyvoice check-data -h

 Usage: everyvoice check-data [OPTIONS] CONFIG_FILE

╭─ Arguments ─────────────────────────────────────────────────────────────╮
│ *    config_file      FILE  The path to your model configuration file.  │
│                             [default: None]                             │
│                             [required]                                  │
╰─────────────────────────────────────────────────────────────────────────╯

The help should answer:

• Of the six config files in config/ generated by the wizard, which ones are OK to use here?
• what gets checked?

By trial and error, this command seems to accept config/everyvoice-aligner.yaml and config/everyvoice-text-to-spec.yaml but the code seems to suggest three types of models are accepted, so we need more clarity.

Related issue, the error messages you get when you choose the wrong type of config file could be improved by listing what models this CLI command accepts in that error message. It is already going in that direction, but it's not clear enough. In particular, "Please pass a valid EveryVoice model or shared data configuration file." is misleading because config/everyvoice-shared-data.yaml tells me "Sorry, your file does not appear to be a valid model configuration.".

How to reproduce the bug

No response

Error messages and logs

# Error messages and logs here please

Environment

Current environment

#- EveryVoice Version:
#- PyTorch Lightning Version (e.g., 2.4.0):
#- PyTorch Version (e.g., 2.4):
#- Python version (e.g., 3.12):
#- OS (e.g., Linux):
#- CUDA/cuDNN version:
#- GPU models and configuration:
#- How you installed EveryVoice (`conda`, `pip`, source):

More info

No response