Implement flag in GH sync to split sync into multiple runs

Currently, there is a 5k/user/hour cap on calls in Github API. As we continue to grow on Github, we have hit an issue where we are hitting this cap in runs. To alleviate some of the pressure, webdev should add a flag that separates main org requests from the rest. As the biggest org by a long shot, this should help reduce the issue for at least the meantime. In the future we may need to look into other solutions for this, or optimize the calls even further to reduce overcalling.

@fgurr @mbarbero we'll need a user to run the second script instance against, otherwise, we are likely putting lipstick on the pig and will still have issues after the split. Once we get the change finished, I can reach out and we can figure out which user goes where!