engineering: Add GCP projects overview

handbook/engineering/environments.md

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+# Environment
+
+This page describes our different cloud environments.
+
+## Google Cloud
+
+We utilize multiple Google Cloud projects and folders to organize our workloads and manage access control.
+
+
+### Root Projects
+
+- **Sourcegraph**: Services for sourcegraph.com.
+- **sourcegraph-code-intel**: Services for Code Intel code execution.
+- **sourcegraph-managed-**: There are multiple `-managed` projects, one for each our managed deployments.
+- **TelligentSourcegraph**: Data pipeline and storage for pings and Cloud event logging.
+- **Sourcegraph Auxiliary**: Testing clusters and deployments.
+- **Universities**: Sourcegraph instances for universities. (Deprecated)
+- **sourcegraph-interviews**: Shared project for interviews.
+- **sourcegraph-calend**: Owned by @sqs.
+- **sourcegraph-orgtool**: Owned by @sqs.
+
+### Folders
+Dynamic or temporary projects are created in the folders listed below.
+
+- **Engineers Projects**: Contains projects used by individual engineers. All projects must be prefixed with `$name-` (the name of the owner). Engineers are expected to remove all their resources once they are done testing.