hosted projects (#8627)

- **Allow joining a hosted project**

You can't yet do anything in a hosted project, but you can join it and
look how empty it is.

Release Notes:

- N/A

crates/collab/src/tests/integration_tests.rs

@@ -22,7 +22,6 @@ use project::{
     search::SearchQuery, DiagnosticSummary, FormatTrigger, HoverBlockKind, Project, ProjectPath,
 };
 use rand::prelude::*;
-use rpc::proto::ChannelRole;
 use serde_json::json;
 use settings::SettingsStore;
 use std::{
@@ -3742,7 +3741,6 @@ async fn test_leaving_project(
             client_b.user_store().clone(),
             client_b.language_registry().clone(),
             FakeFs::new(cx.background_executor().clone()),
-            ChannelRole::Member,
             cx,
         )
     })