Separate the GCP Secret Manager Terraform module from the new deploy

Now that we have settle to a new deploy as demonstrated in rave-core-deploy repo, separate the two modules (secret management and webapp) to their own repos.

changed milestone to %Sprint 92

added chore label

changed time estimate to 4h

added workflowIn Progress label

mentioned in merge request !1 (merged)

added workflowReview Required label and removed workflowIn Progress label

closed via merge request !1 (merged)

mentioned in commit 5fa20da0