They are basically defaults that have been more or less a standard for GCP projects. You should not have any issues deleting them.
Big Query, Cloud Datastore, Cloud SQL have to do with database storage solutions.If your project does not need to leverage any of those services feel free to kick these APIs to the curb.
Cloud Storage,Google Cloud Storage JSON API have to do with file storage (basically App Engine's equivalent to Google Drive or AWS S3)
Service Usage API is good for usage analytics (you might what to keep this one to track usage statistics for the APIs functions you do use)
Service Management API, according to the documentation this has to do with building out service infrastructure on top of App Engine; I don't see any overlap with GAS so you can drop this API
Google Cloud APIs is basically a catch all where you get some very broad oauth scopes(at the project level, GAS projects are client applications so this may not impact them). I'd recommend getting rid of this one if you're publishing add-ons just to be safe.