Fix GitLab logger to only colorize the diagnostic type for better legibility

Co-authored-by: baronfel <573979+baronfel@users.noreply.github.com>

Author: Copilot

src/MSBuild/CICDLogger/GitLab/GitLabLogger.cs

@@ -300,8 +300,10 @@ protected override void OnBuildFinished(BuildFinishedEventArgs e, GitLabProjectD
     private void WriteDiagnostic(string type, string colorCode, string? file, int lineNumber, int columnNumber, string? code, string? message)
     {
         // GitLab uses ANSI color codes for formatting
+        // Only colorize the type for better legibility
         _write(colorCode);  // Color code (red for errors, yellow for warnings)
         _write(type);
+        _write("\x1b[0m");  // Reset color after type
         _write(": ");
 
         if (!string.IsNullOrEmpty(file))
@@ -332,7 +334,6 @@ private void WriteDiagnostic(string type, string colorCode, string? file, int li
         }
 
         _write(message ?? string.Empty);
-        _write("\x1b[0m");  // Reset color
         _write(Environment.NewLine);
     }