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/merge.rs

@@ -44,9 +44,9 @@ fn row() {
 #[test]
 fn single_record_no_overwrite() {
     assert_eq!(
-        nu!(r#"
+        nu!("
             {a: 1, b: 5} | merge {c: 2} | to nuon
-            "#)
+            ")
         .out,
         "{a: 1, b: 5, c: 2}"
     );
@@ -55,9 +55,9 @@ fn single_record_no_overwrite() {
 #[test]
 fn single_record_overwrite() {
     assert_eq!(
-        nu!(r#"
+        nu!("
             {a: 1, b: 2} | merge {a: 2} | to nuon
-            "#)
+            ")
         .out,
         "{a: 2, b: 2}"
     );
@@ -66,9 +66,9 @@ fn single_record_overwrite() {
 #[test]
 fn single_row_table_overwrite() {
     assert_eq!(
-        nu!(r#"
+        nu!("
             [[a b]; [1 4]] | merge [[a b]; [2 4]] | to nuon
-            "#)
+            ")
         .out,
         "[[a, b]; [2, 4]]"
     );
@@ -77,9 +77,9 @@ fn single_row_table_overwrite() {
 #[test]
 fn single_row_table_no_overwrite() {
     assert_eq!(
-        nu!(r#"
+        nu!("
             [[a b]; [1 4]] | merge [[c d]; [2 4]] | to nuon
-            "#)
+            ")
         .out,
         "[[a, b, c, d]; [1, 4, 2, 4]]"
     );
@@ -88,9 +88,9 @@ fn single_row_table_no_overwrite() {
 #[test]
 fn multi_row_table_no_overwrite() {
     assert_eq!(
-        nu!(r#"
+        nu!("
             [[a b]; [1 4] [8 9] [9 9]] | merge [[c d]; [2 4]]  | to nuon
-            "#)
+            ")
         .out,
         "[{a: 1, b: 4, c: 2, d: 4}, {a: 8, b: 9}, {a: 9, b: 9}]"
     );
@@ -99,9 +99,9 @@ fn multi_row_table_no_overwrite() {
 #[test]
 fn multi_row_table_overwrite() {
     assert_eq!(
-        nu!(r#"
+        nu!("
             [[a b]; [1 4] [8 9] [9 9]] | merge  [[a b]; [7 7]]  | to nuon
-            "#)
+            ")
         .out,
         "[[a, b]; [7, 7], [8, 9], [9, 9]]"
     );