Clean up Host.Storage beta.2 reference which does not exist publicly

We accidentally reference something that is only published on an internal feed: https://github.com/Azure/azure-functions-host/blob/d06f2106cd2ddc79f566108b6abe0727d401a26b/src/WebJobs.Script.WebHost/WebJobs.Script.WebHost.csproj#L81

We are making updates (SDK extensions [833](https://github.com/Azure/azure-webjobs-sdk-extensions/issues/833) and [834](https://github.com/Azure/azure-webjobs-sdk-extensions/issues/834)) to those dependencies, and in so doing, we need to fix whatever processes allowed that dependency to end up on something that isn't public.

Start at src/WebJobs.Script.WebHost/WebJobs.Script.WebHost.csproj line 81 and review the dependency updates discussed in SDK extensions issues 833 and 834. Trace how the internal-feed-only Host.Storage beta.2 reference entered the project and identify the relevant dependency process. Done means the non-public reference is removed or corrected and dependencies resolve from the public source.

Written by the indexing model from the issue text.