Replace the current projects code engine DA with a singular project DA

[ocofaigh]

The projects DA variation was created in a way where a list of projects can be passed to the DA and it would create them. Due to EPX limitations, we had to add a "hack" to the outputs to individually output each project like project_1_id, project_2_name, etc etc.

The above approach is hacky, and we should refactor the DA so it only ever configures 1 project. Any stack needing to create more than 1 (such as the RAG stack) should call the DA multiple times.

During refactoring, the DA should be extended to support project level configurations, such as Event subscriptions, Service bindings, Image builds, Domain mappings, Secrets and configmaps, and Integrations: