ONLY OpenFn project files should trigger sync action from GitHub

[christad92]

We want GitHub -> OpenFn Sync to be initiated ONLY when the files linked to an OpenFn project are edited. This is because some users use a repo for multiple projects or applications (e.g. having OpenMRS, Custom App, and OpenFn project), and making a simple change to the readme would automatically trigger a sync, and that could potentially overwrite the project on the app.