prefer-pascal-case: ignore stories that start with underscore

[yannbf]

Issue: N/A

What Changed

Stories that start with underscore should be ignored as they might be written like that to avoid name collision with the components

Checklist

Check the ones applicable to your change:

• [ ] Ran yarn update-all
• [x] Tests are updated
• [ ] Documentation is updated

Change Type

Indicate the type of change your pull request is:

• [ ] maintenance
• [ ] documentation
• [x] patch
• [ ] minor
• [ ] major

[github-actions[bot]]

:rocket: PR was released in v0.3.3 :rocket: