Geo: Show sync percent on bar graph and count within tooltips

What does this MR do?

In Geo admin page available at /admin/geo_nodes, shows sync percentage within stacked progress-bar, and sync item count within tooltip.

Why was this MR needed?

As sync percentage will always be a number between 0 and 100, available width within stacked progress bar is manageable, while sync count could be any large number in worse cases, hence showing it within tooltip is more scalable.

Screenshots

Default	With Tooltip

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
• [ ] Internationalization required/considered
• [ ] If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan

What are the relevant issue numbers?

Closes #4330 (closed)