Use git config --global user.email for email address in automatic Co-authored-by (#32624)

Release Notes:

- Automatic population of `Co-authored-by` now uses `git config --global
user.email`

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Conrad <conrad@zed.dev>

crates/project/src/project.rs

@@ -26,6 +26,7 @@ mod environment;
 use buffer_diff::BufferDiff;
 use context_server_store::ContextServerStore;
 pub use environment::{EnvironmentErrorMessage, ProjectEnvironmentEvent};
+use git::repository::get_git_committer;
 use git_store::{Repository, RepositoryId};
 pub mod search_history;
 mod yarn;
@@ -1323,9 +1324,12 @@ impl Project {
             ),
             EntitySubscription::DapStore(client.subscribe_to_entity::<DapStore>(remote_id)?),
         ];
+        let committer = get_git_committer(&cx).await;
         let response = client
             .request_envelope(proto::JoinProject {
                 project_id: remote_id,
+                committer_email: committer.email,
+                committer_name: committer.name,
             })
             .await?;
         Self::from_join_project_response(