Better Explore Groups view

What does this MR do?

Updates the explore groups view to include a landing help component with dismiss button. It also renames a tab.

This adds ExploreGroupsLanding to control the landing component dismissal.

EE port: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1613

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

New:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #20830 (closed)