Implement `Fully Specced Out` Extended Merge Request Popover
Follow up issue to https://gitlab.com/gitlab-org/gitlab-ce/issues/54916
|Fully specced out||Ready to merge||Barebones||Skeleton loading|
In initial pass, we only did the
Barebones version of this. There is some work to be done to add statistics and creator/assignee to the bottom
This design adds the following:
- Tasks completed/total
- MR Health
- Originally from https://gitlab.com/gitlab-org/gitlab-ce/issues/47007, this gives a good idea of how far towards being merged a MR is.
- We wouldn't be showing extra tooltips on top of a tooltip though.