ssh remoting: Show the host's GitHub name in the titlebar when sharing an SSH project (#19844)

The name (GitHub name) of the host was not displayed when sharing an ssh
project.

Previously we assumed that the a collaborator is a host if the
`replica_id` of the collaborator was `0`,
but for ssh project the `replica_id` is actually `1`.

<img width="329" alt="Screenshot 2024-10-28 at 18 16 30"
src="https://github.com/user-attachments/assets/c0151e12-a96f-4f38-aec1-4ed5475a9eaf">


Co-Authored-by: Thorsten <thorsten@zed.dev>

Release Notes:

- N/A

---------

Co-authored-by: Thorsten <thorsten@zed.dev>

crates/collab/src/db.rs

@@ -740,6 +740,7 @@ impl ProjectCollaborator {
             peer_id: Some(self.connection_id.into()),
             replica_id: self.replica_id.0 as u32,
             user_id: self.user_id.to_proto(),
+            is_host: self.is_host,
         }
     }
 }

crates/collab/src/db/queries/buffers.rs

@@ -116,6 +116,7 @@ impl Database {
                         peer_id: Some(collaborator.connection().into()),
                         user_id: collaborator.user_id.to_proto(),
                         replica_id: collaborator.replica_id.0 as u32,
+                        is_host: false,
                     })
                     .collect(),
             })
@@ -222,6 +223,7 @@ impl Database {
                                 peer_id: Some(collaborator.connection().into()),
                                 user_id: collaborator.user_id.to_proto(),
                                 replica_id: collaborator.replica_id.0 as u32,
+                                is_host: false,
                             })
                             .collect(),
                     },
@@ -257,6 +259,7 @@ impl Database {
                         peer_id: Some(db_collaborator.connection().into()),
                         replica_id: db_collaborator.replica_id.0 as u32,
                         user_id: db_collaborator.user_id.to_proto(),
+                        is_host: false,
                     })
                 } else {
                     collaborator_ids_to_remove.push(db_collaborator.id);
@@ -385,6 +388,7 @@ impl Database {
                 peer_id: Some(connection.into()),
                 replica_id: row.replica_id.0 as u32,
                 user_id: row.user_id.to_proto(),
+                is_host: false,
             });
         }
 

crates/collab/src/db/tests/buffer_tests.rs

@@ -121,11 +121,13 @@ async fn test_channel_buffers(db: &Arc<Database>) {
                 user_id: a_id.to_proto(),
                 peer_id: Some(rpc::proto::PeerId { id: 1, owner_id }),
                 replica_id: 0,
+                is_host: false,
             },
             rpc::proto::Collaborator {
                 user_id: b_id.to_proto(),
                 peer_id: Some(rpc::proto::PeerId { id: 2, owner_id }),
                 replica_id: 1,
+                is_host: false,
             }
         ]
     );

crates/collab/src/rpc.rs

@@ -1827,6 +1827,7 @@ fn join_project_internal(
             peer_id: Some(session.connection_id.into()),
             replica_id: replica_id.0 as u32,
             user_id: guest_user_id.to_proto(),
+            is_host: false,
         }),
     };