Remove repository responsibilities from TeamExplorerServiceHolder (repository refactor part 2)

[jcansdale]

• Depends on Refactor repository models (repository refactor part 1) #2008

What this PR does

TeamExplorerServiceHolder has picked up responsibilities beyond holding services for the Team Explorer views. This PR removes its repository watching and event marshaling responsibilities and delegates them to ITeamExplorerContext. It also removes the need for refreshing a live LocalRepositoryModel, meaning the model can now be immutable after creation.

• Remove ActiveRepo, Subscribe and Unsubscribe from ITeamExplorerServiceHolder
• Remove RefreshCloneUrl from IGitService
• Expose TeamExplorerContext and JoinableTaskFactory from ITeamExplorerServiceHolder (for repo change events and marshaling)

How to test

I've changed code that listens for repository change and refreshes the Team Explorer UI. We need to test moving between repositories and changing the clone URL.

1. Open a repository that it on GitHub
2. Open the Team Explorer - Home view
3. The repository URL should be visible
4. From the command line: git remote rename _origin origin
5. The repository URL and banner should no longer appear
6. From the command line: git remote rename origin _origin
7. The repository URL and banner should re-appear

[grokys]

One thing I noticed: when I change the name of the origin remote I get an exception at this line:

VisualStudio/src/GitHub.InlineReviews/Services/PullRequestSessionManager.cs

Line 241 in 2ce3e84

varaddress=HostAddress.Create(repository.CloneUrl);

We should check to see if repository.CloneUrl is null there. Should that be done here or in a separate PR do you think?

[jcansdale]

@grokys,

We should check to see if repository.CloneUrl is null there. Should that be done here or in a separate PR do you think?

I'd be inclined to look at that in a separate PR. We need to handle the situation when there is no origin remote better. I'm going to show a callout notification when there is no origin remote. I'll look at this as the same time.

[jcansdale]

Merged as part of #2028.