Add group and project count badges to group and project navigation items
The following discussion from gitlab-ce!18425 should be addressed:
- [ ] @godfat started a [discussion](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18425#note_126834567): (+13 comments)
> This can be wrong:
> ...
In gitlab-ce!18425, we've added badge count for projects. The plan was to also add a badge count for groups (see screenshot below) but this requires a concrete plan for further changes in the BE. See the discussion above for more details.
## Screenshots
| Explore | Your Work | User Profile |
| ------ | ------ | ------ |
|  |  |  |
## Proposal
- [ ] The badge should follow the same styling pattern as used for Issues, for instance. Ensure to abbreviate large numbers. 
- [ ] Define what the displayed number should include: Only active groups and projects? All? Including or excluding archived content and content pending deletion?
issue