Update dotcom deployment configuration to consume GSM secrets - non-env vars

Created by: ElizabethStirling

Consume the secrets we just added to the secret manager. This issue is for everything not covered in #17806 (closed), since we have a lot of secrets here, and want to break things up. Can be merged with #17806 (closed) if relevant. Consume the secrets we just added to the secret manager. We should inject the secrets into the k8s deployment as k8s secrets through a CD step, or through GitHub Actions. K8s env vars should be pulled from these secrets. Note - here be dragons 🐉 🐉 🐉 ? There may be edge cases here due to the number of secrets - this needs more research.

Dependencies #17804 (closed)

Useful Links: GitHub action GSM k8s env var from secret

Repository: deploy-sourcegraph-dot-com