Add more usage data to EE ping
This MR loads the EE usage ping asynchronously on the admin application settings page and now includes the counts of the following items:
- Comments
- Groups
- Users
- Projects
- Issues
- Labels
- CI builds
- Snippets
- Milestones
- Todos
- Pushes
- Merge requests
- Environments
- Triggers
- Deploy keys
- Pages
- Project Services
- Issue Boards
- CI Runners
- Deployments
- Geo Nodes
- LDAP Groups
- LDAP Keys
- LDAP Users
- LFS objects
- Protected branches
- Releases
- Remote mirrors
- Web hooks
Closes #997 (closed)