Remove integration tests for Timestream service (#3120)

* Remove integration test for Amazon Timestream

* Add changelog

Author: Madrigal

.changelog/2476a4a9f94c40b8acd9c6b632ee4f91.json

@@ -0,0 +1,8 @@
+{
+    "id": "2476a4a9-f94c-40b8-acd9-c6b632ee4f91",
+    "type": "bugfix",
+    "description": "Remove integration tests for Timestream service",
+    "modules": [
+        "service/internal/integrationtest"
+    ]
+}