Unblock LLM(stream=True) to work with tools (#2582)

* feat: unblock LLM(stream=True) to work with tools

* feat: replace pytest-vcr by pytest-recording

1. pytest-vcr does not support httpx - which LiteLLM uses for streaming responses.
2. pytest-vcr is no longer maintained, last commit 6 years ago :fist::skin-tone-4:
3. pytest-recording supports modern request libraries (including httpx) and actively maintained

* refactor: remove @skip_streaming_in_ci

Since we have fixed streaming response issue we can remove this @skip_streaming_in_ci

---------

Co-authored-by: Lorenze Jay <63378463+lorenzejay@users.noreply.github.com>

tests/tools/agent_tools/agent_tools_test.py

@@ -16,6 +16,13 @@ delegate_tool = tools[0]
 ask_tool = tools[1]
 
 
+@pytest.fixture(scope="module")
+def vcr_config(request) -> dict:
+    return {
+        "cassette_library_dir": "tests/tools/agent_tools/cassettes",
+    }
+
+
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_delegate_work():
     result = delegate_tool.run(