feat(terraform): integrate modular terraform

[rogerthatdev]

• experimental-setup.sh will deploy resources to the ops, staging, and prod projects and optionally run the configure_auth script.
• Deploying triggers is disabled until we integrate them properly into the emblem-app module.

[grayside]

We're going to be aggressive in merging this and working to fix up anything that creates a challenge in follow-up.

Per discussion, Cloud Build triggers are partially implemented a two ways, and neither of them are quite what we want. Correcting that will be in a follow-up. I will file issues later clarifying those actions, which includes rehoming ownership of triggers to app environments.