Entity discovery should automatically popualte project id in catalog-info.yaml/backstage.yaml

[chaughawout]

It would be great if this plugin could collaborate with the @backstage/plugin-catalog-backend-module-gitlab to populate the project id in the entity module automatically if the user does not set the id in the yaml file. I have opened a ticket on their backlog to track the needed changes there as well but wasn't sure how to coordinate the feature across the repos.

backstage/backstage#13118