Add required dropdowns for Analytics
This MR adds the required dropdowns for Analytics.
A smart filter bar is being developed in gitlab-ui and this our our temporary solution until that has been done!
The approach here, of using the older glDropdown jQuery plugin has been used as it best addresses our needs due to gl-dropdown not supporting multi select; which will be added to the dropdowns in this MR in the next iteration.
Edited by Brandon Labuschagne