git_ui: Show author name on commits in branch picker (#36812)

See related discussion
https://github.com/zed-industries/zed/discussions/36511.

<img alt="zed"
src="https://github.com/user-attachments/assets/da7fc30d-2504-48f4-a392-7c8d5cd8acb1"
/>

Release Notes:

- Added option to show the author name in a branch picker commit
information

---------

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

crates/git/src/repository.rs

@@ -150,6 +150,7 @@ pub struct CommitSummary {
     pub subject: SharedString,
     /// This is a unix timestamp
     pub commit_timestamp: i64,
+    pub author_name: SharedString,
     pub has_parent: bool,
 }
 
@@ -987,6 +988,7 @@ impl GitRepository for RealGitRepository {
                     "%(upstream)",
                     "%(upstream:track)",
                     "%(committerdate:unix)",
+                    "%(authorname)",
                     "%(contents:subject)",
                 ]
                 .join("%00");
@@ -2022,6 +2024,7 @@ fn parse_branch_input(input: &str) -> Result<Vec<Branch>> {
         let upstream_name = fields.next().context("no upstream")?.to_string();
         let upstream_tracking = parse_upstream_track(fields.next().context("no upstream:track")?)?;
         let commiterdate = fields.next().context("no committerdate")?.parse::<i64>()?;
+        let author_name = fields.next().context("no authorname")?.to_string().into();
         let subject: SharedString = fields
             .next()
             .context("no contents:subject")?
@@ -2035,6 +2038,7 @@ fn parse_branch_input(input: &str) -> Result<Vec<Branch>> {
                 sha: head_sha,
                 subject,
                 commit_timestamp: commiterdate,
+                author_name: author_name,
                 has_parent: !parent_sha.is_empty(),
             }),
             upstream: if upstream_name.is_empty() {
@@ -2345,7 +2349,7 @@ mod tests {
     fn test_branches_parsing() {
         // suppress "help: octal escapes are not supported, `\0` is always null"
         #[allow(clippy::octal_escapes)]
-        let input = "*\0060964da10574cd9bf06463a53bf6e0769c5c45e\0\0refs/heads/zed-patches\0refs/remotes/origin/zed-patches\0\01733187470\0generated protobuf\n";
+        let input = "*\0060964da10574cd9bf06463a53bf6e0769c5c45e\0\0refs/heads/zed-patches\0refs/remotes/origin/zed-patches\0\01733187470\0John Doe\0generated protobuf\n";
         assert_eq!(
             parse_branch_input(input).unwrap(),
             vec![Branch {
@@ -2362,6 +2366,7 @@ mod tests {
                     sha: "060964da10574cd9bf06463a53bf6e0769c5c45e".into(),
                     subject: "generated protobuf".into(),
                     commit_timestamp: 1733187470,
+                    author_name: SharedString::new("John Doe"),
                     has_parent: false,
                 })
             }]