testing: start using btlr [(#3959)](#3959)

* testing: start using btlr

The binary is at gs://cloud-devrel-kokoro-resources/btlr/v0.0.1/btlr

* add period after DIFF_FROM

* use array for btlr args

* fix websocket tests

* add debug message

* wait longer for the server to spin up

* dlp: bump the wait timeout to 10 minutes

* [run] copy noxfile.py to child directory to avoid gcloud issue

* [iam] fix: only display description when the key exists

* use uuid4 instead of uuid1

* [iot] testing: use the same format for registry id

* Stop asserting Out of memory not in the output

* fix missing imports

* [dns] testing: more retries with delay

* [dlp] testing: longer timeout

* use the max-concurrency flag

* use 30 workers

* [monitoring] use multiple projects

* [dlp] testing: longer timeout

translation/samples/snippets/translate_v3_batch_translate_text_with_model_test.py

@@ -28,7 +28,7 @@
 @pytest.fixture(scope="function")
 def bucket():
     """Create a temporary bucket to store annotation output."""
-    bucket_name = str(uuid.uuid1())
+    bucket_name = f'tmp-{uuid.uuid4().hex}'
     storage_client = storage.Client()
     bucket = storage_client.create_bucket(bucket_name)