to json -r not removing whitespaces fix (#11948)

fixes #11900  

# Description
Use `serde_json` instead.

# User-Facing Changes
The problem described in the issue now no longer persists.

No whitespace in the output of `to json --raw`
Output of unicode escape changed to consistent `\uffff`

# Tests + Formatting
I corrected all Tests that were affected by this change.

Cargo.lock

@@ -2994,6 +2994,7 @@ dependencies = [
  "linked-hash-map",
  "num-traits",
  "serde",
+ "serde_json",
 ]
 
 [[package]]
@@ -4946,9 +4947,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.112"
+version = "1.0.114"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d1bd37ce2324cf3bf85e5a25f96eb4baf0d5aa6eba43e7ae8958870c4ec48ed"
+checksum = "c5f09b1bd632ef549eaa9f60a1f8de742bdbc698e6cee2095fc84dde5f549ae0"
 dependencies = [
  "indexmap",
  "itoa",

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

@@ -14,7 +14,7 @@ fn find_with_list_search_with_string() {
 fn find_with_list_search_with_char() {
     let actual = nu!("[moe larry curly] | find l | to json -r");
 
-    assert_eq!(actual.out, "[\"\u{1b}[37m\u{1b}[0m\u{1b}[41;37ml\u{1b}[0m\u{1b}[37marry\u{1b}[0m\",\"\u{1b}[37mcur\u{1b}[0m\u{1b}[41;37ml\u{1b}[0m\u{1b}[37my\u{1b}[0m\"]");
+    assert_eq!(actual.out, "[\"\\u001b[37m\\u001b[0m\\u001b[41;37ml\\u001b[0m\\u001b[37marry\\u001b[0m\",\"\\u001b[37mcur\\u001b[0m\\u001b[41;37ml\\u001b[0m\\u001b[37my\\u001b[0m\"]");
 }
 
 #[test]
@@ -48,7 +48,7 @@ fn find_with_filepath_search_with_string() {
 
     assert_eq!(
         actual.out,
-        "[\"\u{1b}[37m\u{1b}[0m\u{1b}[41;37marep\u{1b}[0m\u{1b}[37mas.clu\u{1b}[0m\"]"
+        "[\"\\u001b[37m\\u001b[0m\\u001b[41;37marep\\u001b[0m\\u001b[37mas.clu\\u001b[0m\"]"
     );
 }
 
@@ -57,7 +57,7 @@ fn find_with_filepath_search_with_multiple_patterns() {
     let actual =
         nu!(r#"["amigos.txt","arepas.clu","los.txt","tres.txt"] | find arep ami | to json -r"#);
 
-    assert_eq!(actual.out, "[\"\u{1b}[37m\u{1b}[0m\u{1b}[41;37mami\u{1b}[0m\u{1b}[37mgos.txt\u{1b}[0m\",\"\u{1b}[37m\u{1b}[0m\u{1b}[41;37marep\u{1b}[0m\u{1b}[37mas.clu\u{1b}[0m\"]");
+    assert_eq!(actual.out, "[\"\\u001b[37m\\u001b[0m\\u001b[41;37mami\\u001b[0m\\u001b[37mgos.txt\\u001b[0m\",\"\\u001b[37m\\u001b[0m\\u001b[41;37marep\\u001b[0m\\u001b[37mas.clu\\u001b[0m\"]");
 }
 
 #[test]

crates/nu-json/Cargo.toml

@@ -20,6 +20,7 @@ default = ["preserve_order"]
 linked-hash-map = { version = "0.5", optional = true }
 num-traits = "0.2"
 serde = "1.0"
+serde_json = "1.0.114"
 
 [dev-dependencies]
 # nu-path = { path="../nu-path", version = "0.91.1" }

crates/nu-json/src/ser.rs

@@ -1032,8 +1032,9 @@ pub fn to_string_raw<T>(value: &T) -> Result<String>
 where
     T: ser::Serialize,
 {
-    let vec = to_vec(value)?;
-    let string = String::from_utf8(vec)?;
-    let output = string.lines().map(str::trim).collect();
-    Ok(output)
+    let result = serde_json::to_string(value);
+    match result {
+        Ok(result_string) => Ok(result_string),
+        Err(error) => Err(Error::Io(std::io::Error::from(error))),
+    }
 }

src/tests/test_converters.rs

@@ -45,3 +45,11 @@ fn to_json_escaped() -> TestResult {
         r#"{"foo":{"bar":"[{\"a\":\"b\",\"c\": 2}]"}}"#,
     )
 }
+
+#[test]
+fn to_json_raw_backslash_in_quotes() -> TestResult {
+    run_test(
+        r#"{a: '\', b: 'some text'} | to json -r"#,
+        r#"{"a":"\\","b":"some text"}"#,
+    )
+}