Paginated epics list

What does this MR do?

• Add paginated epics list
• Add epics to navbar

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

Shouldn't be

Why was this MR needed?

Deliverable

Screenshots (if relevant)

Empty State	List

TODO

• Add active highlight for nav sidebar
• Add check to only display epic nav if EEU
• Add epic icon to nav sidebar
• Automatically highlight All tab in epics list page
• Test pagination
• Add tests

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #3553 (closed)

/cc @ClemMakesApps