[Question/Feedback]: Azure DevOps repository sync with GitHub and vice versa

### Check for previous/existing GitHub issues

- [X] I have checked for previous/existing GitHub issues

### **Feature request**
Allow syncing/tracking between Azure DevOps repositories and GitHub and vice versa.

### **Description**

After an enterprise adopts AVM, there might be a need to customise a given module’s functionality due to some specific internal use case. In such scenarios it makes perfect sense to create a fork on GitHub and apply the necessary customisation.

However, this could be challenging in the long run for enterprises who have adopted Azure DevOps repositories. After importing the repositories into AzDO, there would be no easy way to track / sync changes from the upstream repository and therefore could risk missing out on important security and feature updates. The workaround to [synchronise multiple remote Git repositories](https://devblogs.microsoft.com/ise/synchronizing-multiple-remote-git-repositories/) offers a solution but is a little cumbersome.
Therefore, it would be nice to allow syncing/tracking between AzDO repos and GitHub and vice versa.