App doing too many unecessary reads from Firebase

[andreia-ferreira]

• SyncSurveyUseCase syncs all LOIs of the entire survey. Even if a user makes just 1 submission , a sync event for the whole survey data will be triggered for all users that have that survey

• There are no unsubscribeFromTopic calls anywhere, which means that even if a user eventually deletes a survey from the device, they will silently still get its updates Unsubscribe from survey updates when removing them from the device #3876 ; Unsubscribe from survey updates after clearing user session #3888

• User LOIs are downloaded twice per sync when dataVisibility == ALL_SURVEY_PARTICIPANTS Remove duplicated survey downloads during sync #3889