chore(graphql): only stringify graphql error extension attributes in span event if not a native type (#5212)

* only stringify graphql error extension value if the value is not a number or bool

* fix reviewer comments

Author: wconti27

packages/datadog-plugin-graphql/src/utils.js

@@ -27,7 +27,14 @@ function extractErrorIntoSpanEvent (config, span, exc) {
   if (config.graphqlErrorExtensions) {
     for (const ext of config.graphqlErrorExtensions) {
       if (exc.extensions?.[ext]) {
-        attributes[`extensions.${ext}`] = exc.extensions[ext].toString()
+        const value = exc.extensions[ext]
+
+        // We should only stringify the value if it is not of type number or boolean
+        if (typeof value === 'number' || typeof value === 'boolean') {
+          attributes[`extensions.${ext}`] = value
+        } else {
+          attributes[`extensions.${ext}`] = String(value)
+        }
       }
     }
   }