fix(cargo-package): add more traces (#14960)

### What does this PR try to resolve?

This helps debug <#14955>.

### How should we test and review this PR?

While `check_repo_state` is the culprit, let's add some traces for
future.

### Additional information

src/cargo/ops/cargo_package.rs

@@ -94,6 +94,7 @@ struct GitVcsInfo {
 }
 
 // Builds a tarball and places it in the output directory.
+#[tracing::instrument(skip_all)]
 fn create_package(
     ws: &Workspace<'_>,
     pkg: &Package,
@@ -372,6 +373,7 @@ fn local_deps<T>(packages: impl Iterator<Item = (Package, T)>) -> LocalDependenc
 }
 
 /// Performs pre-archiving checks and builds a list of files to archive.
+#[tracing::instrument(skip_all)]
 fn prepare_archive(
     ws: &Workspace<'_>,
     pkg: &Package,
@@ -400,6 +402,7 @@ fn prepare_archive(
 }
 
 /// Builds list of files to archive.
+#[tracing::instrument(skip_all)]
 fn build_ar_list(
     ws: &Workspace<'_>,
     pkg: &Package,
@@ -730,6 +733,7 @@ fn check_metadata(pkg: &Package, gctx: &GlobalContext) -> CargoResult<()> {
 /// has not been passed, then `bail!` with an informative message. Otherwise
 /// return the sha1 hash of the current *HEAD* commit, or `None` if no repo is
 /// found.
+#[tracing::instrument(skip_all)]
 fn check_repo_state(
     p: &Package,
     src_files: &[PathBuf],
@@ -780,7 +784,7 @@ fn check_repo_state(
     return Ok(None);
 
     fn git(
-        p: &Package,
+        pkg: &Package,
         src_files: &[PathBuf],
         repo: &git2::Repository,
         opts: &PackageOpts<'_>,
@@ -803,7 +807,7 @@ fn check_repo_state(
             .iter()
             .filter(|src_file| dirty_files.iter().any(|path| src_file.starts_with(path)))
             .map(|path| {
-                path.strip_prefix(p.root())
+                path.strip_prefix(pkg.root())
                     .unwrap_or(path)
                     .display()
                     .to_string()

src/cargo/sources/path.rs

@@ -93,6 +93,7 @@ impl<'gctx> PathSource<'gctx> {
     /// are relevant for building this package, but it also contains logic to
     /// use other methods like `.gitignore`, `package.include`, or
     /// `package.exclude` to filter the list of files.
+    #[tracing::instrument(skip_all)]
     pub fn list_files(&self, pkg: &Package) -> CargoResult<Vec<PathBuf>> {
         list_files(pkg, self.gctx)
     }