feat: add public squad about step in checklist

[ilasw]

Changes

• Added Learn about Squads step in squad's checklist for admin;
• Moved checks on step visibility inside the single steps using condition optional property;
• Fixed wrong label adding Approved label for public request.

Events

Did you introduce any new tracking events?

Experiment

Did you introduce any new experiments?

Manual Testing

[!CAUTION] Please make sure existing components are not breaking/affected by this PR

Preview domain

https://mi-491-squad-checklist.preview.app.daily.dev