Fold Reusable Workflows Into One File Where Appropriate #345
Description
Background
Initially, some reusable workflows were created under the assumption that they would contain multiple jobs that needed to be matrixed together (eg. deploy-1-setup.yml -> deploy-2-start.yml, ci-closed.yml -> undeploy-1-start.yml).
However, this has not eventuated, and due to how GitHub Environments are scoped to a single job rather than a workflow, they probably won't be.
This means that we can collapse some levels of reusable workflows, reducing LOC and unneeded creation/pulling of artifacts from other reusable workflows.