test(tracer): add targets to run test in both runtimes

Author: ijemmy

packages/tracing/package.json

@@ -13,7 +13,9 @@
     "commit": "commit",
     "test": "npm run test:unit",
     "test:unit": "jest --group=unit --detectOpenHandles --coverage --verbose",
-    "test:e2e": "jest --group=e2e",
+    "test:e2e:nodejs12x": "RUNTIME=nodejs12x jest --group=e2e",
+    "test:e2e:nodejs14x": "RUNTIME=nodejs14x jest --group=e2e",
+    "test:e2e": "concurrently \"npm:test:e2e:nodejs12x\" \"npm:test:e2e:nodejs14x\"",
     "watch": "jest --watch",
     "build": "tsc",
     "lint": "eslint --ext .ts --fix --no-error-on-unmatched-pattern src tests",