fix: restore json_parser with timestamp parsing based on local testing

freeleaps/helm-pkg/centralStorage/templates/central-storage/opentelemetry.yaml

@@ -49,7 +49,14 @@ spec:
         start_at: end
         include_file_path: false
         include_file_name: false
-        operators: []
+        operators:
+          - type: json_parser
+            parse_from: body
+            parse_to: attributes
+            timestamp:
+              parse_from: attributes.timestamp
+              layout: UnixMilli
+              location: UTC
     processors:
       resource:
         attributes: