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/project/src/git_store.rs

@@ -4752,6 +4752,7 @@ fn branch_to_proto(branch: &git::repository::Branch) -> proto::Branch {
                 sha: commit.sha.to_string(),
                 subject: commit.subject.to_string(),
                 commit_timestamp: commit.commit_timestamp,
+                author_name: commit.author_name.to_string(),
             }),
     }
 }
@@ -4781,6 +4782,7 @@ fn proto_to_branch(proto: &proto::Branch) -> git::repository::Branch {
                 sha: commit.sha.to_string().into(),
                 subject: commit.subject.to_string().into(),
                 commit_timestamp: commit.commit_timestamp,
+                author_name: commit.author_name.to_string().into(),
                 has_parent: true,
             }
         }),