feat: ValidateAuthToken revoked when user is logged out, reason added to response message

...igbluebutton/core/apps/users/RegisterUserReqMsgHdlr.scala

...g/bigbluebutton/core/apps/users/UserLeaveReqMsgHdlr.scala

...ebutton/core/apps/users/ValidateAuthTokenReqMsgHdlr.scala

...scala/org/bigbluebutton/core/models/RegisteredUsers.scala

.../org/bigbluebutton/core2/message/senders/MsgBuilder.scala

...ore2/message/senders/ValidateAuthTokenRespMsgSender.scala

.../main/scala/org/bigbluebutton/common2/msgs/UsersMgs.scala