docs(samples): add auto-generated Node samples (#656)

* docs(samples): add auto-generated Node samples build(generator): find protoc based on its bazel location

PiperOrigin-RevId: 398604509

Source-Link: googleapis/googleapis@6ef16b9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/8314e1ead3e906dbf2012ced8d92f2bc8dd45c95
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiODMxNGUxZWFkM2U5MDZkYmYyMDEyY2VkOGQ5MmYyYmM4ZGQ0NWM5NSJ9

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* build: ugprade samples engine to Node 10

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Sofia Leon <sofialeon@google.com>

Author: gcf-owl-bot[bot]

dlp/package.json

@@ -9,7 +9,7 @@
     "*.js"
   ],
   "engines": {
-    "node": ">=8"
+    "node": ">=10"
   },
   "scripts": {
     "test": "mocha system-test/*.test.js --timeout=600000"