docs(samples): add try/catch to delete operations in testing (#19)

* add try/catch to delete operations in testing

* refactor test file; use timestamp for resource names, clean up resources over an hour old, move create and delete operations to before and after hooks in each test suite

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packages/google-cloud-video-stitcher/samples/package.json

@@ -18,7 +18,6 @@
   "devDependencies": {
     "c8": "^7.1.0",
     "chai": "^4.2.0",
-    "mocha": "^8.0.0",
-    "uuid": "^8.0.0"
+    "mocha": "^8.0.0"
   }
 }