- Removed the CassandraChatMemory class and its usages, now using CassandraChatMemoryRepository. - Updated configuration, repository, and test classes to rely on CassandraChatMemoryRepository. - Cleaned up related configuration and integration tests. - Minor doc update to reflect the removal. Fixes #3090 Signed-off-by: Mark Pollack <mark.pollack@broadcom.com>