Fix broken removal of sockets (#2629)

* make sort-by fail gracefully if mismatched types are compared

* Added a test to check if sorted-by with invalid types exists gracefully

* Linter changes

* removed redundant pattern matching

* Changed the error message

* Added a comma after every argument

* Changed the test to accomodate the new err messages

* Err message for sort-by invalid types now shows the mismatched types

* Lints problems

* Changed unwrap to expect

* Added the -f flag to rm command

Now when you a use rm -f there will be no error message, even if the
file doesnt actually exist

* Lint problems

* Fixed the wrong line

* Removed println

* Spelling mistake

* Fix problems when you mv a file into itself

* Lint mistakes

* Remove unecessary filtering in most cases

* Allow the removal of sockets

* Conditional compilations to systems without socket

crates/nu-cli/src/shell/filesystem_shell.rs

@@ -596,9 +596,15 @@ impl Shell for FilesystemShell {
                 };
 
                 if let Ok(metadata) = f.symlink_metadata() {
+                    #[cfg(unix)]
+                    let is_socket = metadata.file_type().is_socket();
+                    #[cfg(not(unix))]
+                    let is_socket = false;
+
                     if metadata.is_file()
                         || metadata.file_type().is_symlink()
                         || recursive.item
+                        || is_socket
                         || is_empty()
                     {
                         let result;
@@ -620,7 +626,7 @@ impl Shell for FilesystemShell {
                         }
                         #[cfg(not(feature = "trash-support"))]
                         {
-                            result = if metadata.is_file() {
+                            result = if metadata.is_file() || is_socket {
                                 std::fs::remove_file(&f)
                             } else {
                                 std::fs::remove_dir_all(&f)