git: Fix panic in git2 due to empty repo paths (#42304)

Fixes ZED-1VR

Release Notes:

- Fixed sporadic panic in git features

crates/project/src/git_store/conflict_set.rs

@@ -264,7 +264,7 @@ mod tests {
     use super::*;
     use fs::FakeFs;
     use git::{
-        repository::repo_path,
+        repository::{RepoPath, repo_path},
         status::{UnmergedStatus, UnmergedStatusCode},
     };
     use gpui::{BackgroundExecutor, TestAppContext};
@@ -617,7 +617,7 @@ mod tests {
         cx.run_until_parked();
         fs.with_git_state(path!("/project/.git").as_ref(), true, |state| {
             state.unmerged_paths.insert(
-                rel_path("a.txt").into(),
+                RepoPath::from_rel_path(rel_path("a.txt")),
                 UnmergedStatus {
                     first_head: UnmergedStatusCode::Updated,
                     second_head: UnmergedStatusCode::Updated,

crates/project/src/git_store/pending_op.rs

@@ -46,7 +46,7 @@ impl Item for PendingOps {
 
     fn summary(&self, _cx: ()) -> Self::Summary {
         PathSummary {
-            max_path: self.repo_path.0.clone(),
+            max_path: self.repo_path.as_ref().clone(),
             item_summary: PendingOpsSummary {
                 staged_count: self.staged() as usize,
                 staging_count: self.staging() as usize,
@@ -73,7 +73,7 @@ impl KeyedItem for PendingOps {
     type Key = PathKey;
 
     fn key(&self) -> Self::Key {
-        PathKey(self.repo_path.0.clone())
+        PathKey(self.repo_path.as_ref().clone())
     }
 }