CreateAzureDevOpsFeed broken for non-dnceng orgs

[michellemcdaniel]

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

In the Staging pipeline, we create feeds in dnceng-stage in the testing pipeline. This functionality no longer works because GetFeedVisibilityTag throws an exception for this org. The Feed Visibility Tag is only required for when there is no FeedName passed in, so the call to GetFeedVisibilityTag should, at a minimum, only be called when FeedName is null or empty (this would be good enough for our case because we aren't creating darc-pub/darc-int feeds, we are supplying our own feed names).

Additionally, GetFeedVisibilityTag shouldn't throw an exception for dnceng-stage.

[michellemcdaniel]

@mmitche This is blocking the dotnet-release rollout.

[mmitche]

@adiaaida #8082

[ChadNedzlek]

It sounds like this is resolved? I'm going to close it.