Feature Request: BAR should have channel descriptions

[mmitche]

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

BAR should have the ability to add a description for a channel, so that we can document what various channels should be used for.

Release Note Category

• [x] Feature changes/additions
• [ ] Bug fixes
• [ ] Internal Infrastructure Improvements

  Release Note Description

[dougbu]

Small request here: Could the canonical description include the main associated feeds e.g. mention that the .NET 6 channel corresponds to the dotnet6-transport feed❔ I know this is nuanced w/ some packages eventually getting to dotnet6 as well, but this would be a start. For example, I never remember what feed gets transport packages in the General Testing channel.

[mmitche]

general-testing gets transport and shipping packages. But yeah that's a good idea.