Fix rm for symlinks pointing to directory on windows (issue #11461) (#11463)

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- this PR closes #11461

# Description
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Using `std::fs::remove_dir` instead of `std::fs::remove_file` when try
remove symlinks pointing to a directory on Windows.

# User-Facing Changes
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helps us keep track of breaking changes. -->

none

# Tests + Formatting
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- `cargo test --workspace` to check that all tests pass (on Windows make
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crates/nu-std"` to run the tests for the standard library

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- [x] `cargo fmt --all -- --check` to check standard code formatting
(`cargo fmt --all` applies these changes)
- [x] `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used`
to check that you're using the standard code style
- [x] `cargo test --workspace` to check that all tests pass (on Windows
make sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- I got 2 test fails on my Windows devenv; these fails in main branch
too
- `commands::complete::basic` : passed on Ubuntu, failed on Windows (a
bug?)
- `commands::cp::copy_file_with_read_permission`: failed on Windows with
Japanese environment (This test refers error message, so that fails on
environments using a language except for english.)
- [x] `cargo run -- -c "use std testing; testing run-tests --path
crates/nu-std"` to run the tests for the standard library

# After Submitting
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This fix has no changes to user-facing interface.

crates/nu-command/src/filesystem/rm.rs

@@ -381,11 +381,23 @@ fn rm(
                         {
                             unreachable!()
                         }
-                    } else if metadata.is_file()
-                        || is_socket
-                        || is_fifo
-                        || metadata.file_type().is_symlink()
+                    } else if metadata.is_symlink() {
+                        // In Windows, symlink pointing to a directory can be removed using
+                        // std::fs::remove_dir instead of std::fs::remove_file.
+                        #[cfg(windows)]
                         {
+                            f.metadata().and_then(|metadata| {
+                                if metadata.is_dir() {
+                                    std::fs::remove_dir(&f)
+                                } else {
+                                    std::fs::remove_file(&f)
+                                }
+                            })
+                        }
+
+                        #[cfg(not(windows))]
+                        std::fs::remove_file(&f)
+                    } else if metadata.is_file() || is_socket || is_fifo {
                         std::fs::remove_file(&f)
                     } else {
                         std::fs::remove_dir_all(&f)

crates/nu-command/tests/commands/rm.rs

@@ -375,6 +375,19 @@ fn removes_symlink() {
     });
 }
 
+#[test]
+fn removes_symlink_pointing_to_directory() {
+    Playground::setup("rm_symlink_to_directory", |dirs, sandbox| {
+        sandbox.mkdir("test").symlink("test", "test_link");
+
+        nu!(cwd: sandbox.cwd(), "rm test_link");
+
+        assert!(!dirs.test().join("test_link").exists());
+        // The pointed directory should not be deleted.
+        assert!(dirs.test().join("test").exists());
+    });
+}
+
 #[test]
 fn removes_file_after_cd() {
     Playground::setup("rm_after_cd", |dirs, sandbox| {