add condition in sql/mongo tracker store in additional_events when retrieve_events_from_previous_conversation_sessions is true

[indam23]

Proposed changes:

• closes Events in tracker increase exponentially after each restarted event when retrieve_events_from_previous_conversation_sessions: true for SQL/MongoTrackerStore #8238
• closes Two action_listen events appended to tracker when retrieve_events_from_previous_conversation_sessions: true for SQL/MongoTrackerStore #8237
• fix calculation of _additional_events when retrieve_events_from_previous_conversation_sessions=true

Status (please check what you already did):

• added some tests for the functionality
• updated the documentation
• updated the changelog (please check changelog for instructions)
• reformat files using black (please check Readme for instructions)

[wochinge]

Change looks good overall - could you please add a test to avoid regression?

[indam23]

I parametrized the existing tests to confirm same behaviour - is there another side that should be tested?

[indam23]

tests/core/test_evaluation.py::test_e2e_with_entity_evaluation is failing although it passes locally; can it be because the timeout for the test (240) is longer than the timeout for the pytest session (120s)?

[wochinge]

Thanks for the fix! The parametrize updates to the tests are amazing 💯 🥇