fix: skip channel.state.last_message_at update on incoming system message if configured#1642

MartinCupela merged 2 commits intomasterGetStream/stream-chat-js:masterfrom

fix/ignore-last_message_at-on-skip_last_msg_update_for_system_msgsGetStream/stream-chat-js:fix/ignore-last_message_at-on-skip_last_msg_update_for_system_msgsCopy head branch name to clipboard