Accommodating offer rejection end condition

[ashishpanchal33]

Issue: (Class AlternatingGameEndsOnTag) The end_tag was restricted to ACCEPTING_TAG only, causing the game to continue with invalid conversations when an offer was rejected. This led to incorrect game behavior.

Fix: Updated end_tag to be a list containing both ACCEPTING_TAG and REJECTION_TAG.

Impact:

Adjusted the game_over function to check if response is included in the end_tag list.

Ensured the game logic properly handles both accepted and rejected offers, improving game flow and correctness.