Revert skip decorators to check if tests are flaky

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/crew_test.py

@@ -3936,9 +3936,6 @@ def test_crew_guardrail_feedback_in_context():
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
-@pytest.mark.skipif(
-    sys.version_info.minor == 11, reason="VCR cassette issues in Python 3.11"
-)
 def test_before_kickoff_callback():
     from crewai.project import CrewBase, agent, before_kickoff, task
 

tests/knowledge/knowledge_test.py

@@ -568,9 +568,6 @@ def test_docling_source(mock_vector_db):
     mock_vector_db.query.assert_called_once()
 
 
-@pytest.mark.skipif(
-    sys.version_info.minor == 11, reason="VCR cassette issues in Python 3.11"
-)
 def test_multiple_docling_sources():
     urls: List[Union[Path, str]] = [
         "https://lilianweng.github.io/posts/2024-11-28-reward-hacking/",