Fix: remove unnecessary r#"..."# (#8670) (#9764)

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# Description
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This PR is related to **Tests: clean up unnecessary use of cwd,
pipeline(), etc.
[#8670](https://github.com/nushell/nushell/issues/8670)**

- Removed the `r#"..."#` raw string literal syntax, which is unnecessary
when there are no special characters that need quoting from the tests
that use the `nu!` macro.
- `cwd:` and `pipeline()` has not changed


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

@@ -30,7 +30,7 @@ fn writes_out_list() {
 
         nu!(
             cwd: dirs.root(),
-            r#"[a b c d] | save save_test_3/list_sample.txt"#,
+            "[a b c d] | save save_test_3/list_sample.txt",
         );
 
         let actual = file_contents(expected_file);
@@ -185,7 +185,7 @@ fn save_failure_not_overrides() {
         nu!(
             cwd: dirs.root(),
             // Writing number to file as toml fails
-            r#"3 | save save_test_10/result.toml -f"#
+            "3 | save save_test_10/result.toml -f"
         );
         let actual = file_contents(expected_file);
         assert_eq!(actual, "Old content");
@@ -272,7 +272,7 @@ fn save_list_stream() {
 
         nu!(
             cwd: dirs.root(),
-            r#"[a b c d] | each {|i| $i} | save -r save_test_13/list_sample.txt"#,
+            "[a b c d] | each {|i| $i} | save -r save_test_13/list_sample.txt",
         );
 
         let actual = file_contents(expected_file);
@@ -289,7 +289,7 @@ fn writes_out_range() {
 
         nu!(
             cwd: dirs.root(),
-            r#"1..3 | save save_test_14/list_sample.json"#,
+            "1..3 | save save_test_14/list_sample.json",
         );
 
         let actual = file_contents(expected_file);