Plan Branch Dashboards and Filtered or Pivoted Views

Similar to the mechanism on Plans themselves allowing a dropdown to switch between branches, having 1) the ability to specify on a branch name whether to enable this and 2) a dropdown on the dashboard itself to switch the view from the primary plans to a branch name would perhaps solve issues I raised in BAM-12259 and BAM-12262: We have dozens of plans in Bamboo that are either 1) all labeled together in Git for a release candidate or 2) could be all labeled together in Bamboo for a release candidate and hence could have their own common dashboard showing the status of the builds occurring for that common branch name or common label.