Revert "fix(telemetry): remove telemetry tests :("

This reverts commit aca1d6352c.

tests/integration/telemetry/collectors/__init__.py

@@ -0,0 +1,19 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+"""Telemetry collector helpers for integration tests."""
+
+from .base import BaseTelemetryCollector, SpanStub
+from .in_memory import InMemoryTelemetryCollector, InMemoryTelemetryManager
+from .otlp import OtlpHttpTestCollector
+
+__all__ = [
+    "BaseTelemetryCollector",
+    "SpanStub",
+    "InMemoryTelemetryCollector",
+    "InMemoryTelemetryManager",
+    "OtlpHttpTestCollector",
+]