PRP-161 Add additional resources

[aplybeah]

Ticket

https://wicmtdp.atlassian.net/browse/PRP-161

Changes

• Add additional ECS service for the staff portal
• Move DB module
• Duplicate ECS task, related resources for the staff portal
• Create skeleton module for doc upload bucket

  Context for reviewers

  Architecture in the repo needs to match the diagram in our security and compliance doc

Testing

TBA

[rocketnova]

@aplybeah We've pulled in everything in this PR (except for S3 doc upload related items) into #14, so I'm closing this PR. Please re-open a separate PR just for S3 doc upload when you're ready!