Visualize active vs idle stage times in enforced workflow group board for VSM
### Relevant epics - https://gitlab.com/groups/gitlab-org/-/epics/364 - https://gitlab.com/groups/gitlab-org/-/epics/424 - https://gitlab.com/groups/gitlab-org/-/epics/505 - https://gitlab.com/groups/gitlab-org/-/epics/433 - https://gitlab.com/groups/gitlab-org/-/epics/229 - Follow up of https://gitlab.com/groups/gitlab-org/-/epics/228. ![waste-staggered](/uploads/00f7e658b57942bdb6b192b67f5e8c59/waste-staggered.png) ![Screen_Shot_2018-10-09_at_14.46.47](/uploads/4ecf0f86e503b165f065951c1e4b936b/Screen_Shot_2018-10-09_at_14.46.47.png) ![Screen_Shot_2018-10-09_at_14.46.40](/uploads/0523981200190b3a3272b9836cff1e7e/Screen_Shot_2018-10-09_at_14.46.40.png) ![Screen_Shot_2018-10-09_at_14.47.03](/uploads/25e36839d6100379a9b5685a6719dcf2/Screen_Shot_2018-10-09_at_14.47.03.png) ![Screen_Shot_2018-10-09_at_14.46.58](/uploads/816f543e55221535b0979d218209caf2/Screen_Shot_2018-10-09_at_14.46.58.png) ![Screen_Shot_2018-10-09_at_14.47.11](/uploads/2a4091dea69a94364f85555cd2bb3c38/Screen_Shot_2018-10-09_at_14.47.11.png)
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