Move rule code from `description` to `check_name` in GitLab output serializer (#16437)

crates/ruff_linter/src/message/gitlab.rs

@@ -90,13 +90,22 @@ impl Serialize for SerializedMessages<'_> {
             }
             fingerprints.insert(message_fingerprint);
 
-            let description = if let Some(rule) = message.rule() {
+            let (description, check_name) = if let Some(rule) = message.rule() {
-                format!("({}) {}", rule.noqa_code(), message.body())
+                (message.body().to_string(), rule.noqa_code().to_string())
             } else {
-                message.body().to_string()
+                let description = message.body();
+                let description_without_prefix = description
+                    .strip_prefix("SyntaxError: ")
+                    .unwrap_or(description);
+
+                (
+                    description_without_prefix.to_string(),
+                    "syntax-error".to_string(),
+                )
             };
 
             let value = json!({
+                "check_name": check_name,
                 "description": description,
                 "severity": "major",
                 "fingerprint": format!("{:x}", message_fingerprint),

crates/ruff_linter/src/message/snapshots/ruff_linter__message__gitlab__tests__output.snap

@@ -1,11 +1,11 @@
 ---
 source: crates/ruff_linter/src/message/gitlab.rs
 expression: redact_fingerprint(&content)
-snapshot_kind: text
 ---
 [
   {
-    "description": "(F401) `os` imported but unused",
+    "check_name": "F401",
+    "description": "`os` imported but unused",
     "fingerprint": "<redacted>",
     "location": {
       "lines": {
@@ -17,7 +17,8 @@ snapshot_kind: text
     "severity": "major"
   },
   {
-    "description": "(F841) Local variable `x` is assigned to but never used",
+    "check_name": "F841",
+    "description": "Local variable `x` is assigned to but never used",
     "fingerprint": "<redacted>",
     "location": {
       "lines": {
@@ -29,7 +30,8 @@ snapshot_kind: text
     "severity": "major"
   },
   {
-    "description": "(F821) Undefined name `a`",
+    "check_name": "F821",
+    "description": "Undefined name `a`",
     "fingerprint": "<redacted>",
     "location": {
       "lines": {

crates/ruff_linter/src/message/snapshots/ruff_linter__message__gitlab__tests__syntax_errors.snap

@@ -1,11 +1,11 @@
 ---
 source: crates/ruff_linter/src/message/gitlab.rs
 expression: redact_fingerprint(&content)
-snapshot_kind: text
 ---
 [
   {
-    "description": "SyntaxError: Expected one or more symbol names after import",
+    "check_name": "syntax-error",
+    "description": "Expected one or more symbol names after import",
     "fingerprint": "<redacted>",
     "location": {
       "lines": {
@@ -17,7 +17,8 @@ snapshot_kind: text
     "severity": "major"
   },
   {
-    "description": "SyntaxError: Expected ')', found newline",
+    "check_name": "syntax-error",
+    "description": "Expected ')', found newline",
     "fingerprint": "<redacted>",
     "location": {
       "lines": {