WIP: Refactor project list into vue components

What does this MR do?

Refactors the project list into vue components

• Mount vue component + data loading
• Project list counts
• Project avatar / icon
• Project title
• Project access
• Visibility level
• CI pipeline status
• Pagination
  • Explore only uses prev/next for pagination, no numbered pages
• Update specs
• Add feature flag vue_projects_list

What are the relevant issue numbers?

#56992 (closed) #63736 (moved)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer