Update snippets empty state

What does this MR do and why?

• Migrate empty state to Pajamas component.
• Add empty state component to empty search result.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Got to http://gdk.test:3000/dashboard/snippets?scope=are_private or any other tab with 0 snippets
2. See the first empty state
3. Go to http://gdk.test:3000/admin/users/reported_user_21
4. Click [Impersonate]
5. Go to http://gdk.test:3000/dashboard/snippets
6. See the second empty state

Don't forget to stop impersonating by clicking the incognito icon near your profile picture.

#457239 (closed)