Revert "feat: add prompt observability code (#2027)" (#2211)

* Revert "feat: add prompt observability code (#2027)"

This reverts commit 90f1bee602.

* Fix issues with flows post merge

* Decoupling telemetry and ensure tests  (#2212)

* feat: Enhance event listener and telemetry tracking

- Update event listener to improve telemetry span handling
- Add execution_span field to Task for better tracing
- Modify event handling in EventListener to use new span tracking
- Remove debug print statements
- Improve test coverage for crew and flow events
- Update cassettes to reflect new event tracking behavior

* Remove telemetry references from Crew class

- Remove Telemetry import and initialization from Crew class
- Delete _telemetry attribute from class configuration
- Clean up unused telemetry-related code

* test: Improve crew verbose output test with event log filtering

- Filter out event listener logs in verbose output test
- Ensure no output when verbose is set to False
- Enhance test coverage for crew logging behavior

* dropped comment

* refactor: Improve telemetry span tracking in EventListener

- Remove `execution_span` from Task class
- Add `execution_spans` dictionary to EventListener to track spans
- Update task event handlers to use new span tracking mechanism
- Simplify span management across task lifecycle events

* lint

* Fix failing test

---------

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

tests/utilities/test_events.py

@@ -606,7 +606,7 @@ def test_llm_emits_call_failed_event():
         received_events.append(event)
 
     error_message = "Simulated LLM call failure"
-    with patch.object(LLM, "_call_llm", side_effect=Exception(error_message)):
+    with patch("crewai.llm.litellm.completion", side_effect=Exception(error_message)):
         llm = LLM(model="gpt-4o-mini")
         with pytest.raises(Exception) as exc_info:
             llm.call("Hello, how are you?")