Feature request: barviz should only show subscriptions for the given channel

[michellemcdaniel]

• This issue is blocking
• This issue is causing unreasonable pain

Currently, on BarViz, if you click on a channel and then a repo and look at the subscription list, it shows ALL of the subscriptions. This list should be filtered by the channel we are looking at

Release Note Category

• Feature changes/additions
• Bug fixes
• Internal Infrastructure Improvements

Release Note Description