v2 Metrics - Usage

- [x] Clinic - % users from each of the 3 lines
- [x] CHW - % users from each of the 3 lines
- [x] Personal - % users from each of the 3 lines
- [x] Clinic - position in process where a user “drops-off” (session timeout) if Registration not completed (bar graph showing total number of drop off per question)
- [x] CHW - position in process where a user “drops-off” (session timeout) if Registration not completed (bar graph showing total number of drop off per question)
- [x] Personal - position in process where a user “drops-off” (session timeout) if Registration not completed (bar graph showing total number of drop off per question)
- [x] % Clinic - incomplete vs complete registrations
- [x] % CHW - incomplete vs complete registrations
- [x] % Personal - incomplete vs complete registrations
- [x] Fix tests indentation issues