Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/git/src/repository.rs

@@ -269,10 +269,8 @@ impl GitExcludeOverride {
     pub async fn restore_original(&mut self) -> Result<()> {
         if let Some(ref original) = self.original_excludes {
             smol::fs::write(&self.git_exclude_path, original).await?;
-        } else {
-            if self.git_exclude_path.exists() {
-                smol::fs::remove_file(&self.git_exclude_path).await?;
-            }
+        } else if self.git_exclude_path.exists() {
+            smol::fs::remove_file(&self.git_exclude_path).await?;
         }
 
         self.added_excludes = None;
@@ -2052,7 +2050,7 @@ fn parse_branch_input(input: &str) -> Result<Vec<Branch>> {
 }
 
 fn parse_upstream_track(upstream_track: &str) -> Result<UpstreamTracking> {
-    if upstream_track == "" {
+    if upstream_track.is_empty() {
         return Ok(UpstreamTracking::Tracked(UpstreamTrackingStatus {
             ahead: 0,
             behind: 0,