Add network connectivity for NOMIS

[davidkelliott]

User Story

https://mojdt.slack.com/archives/C01A7QK5VM1/p1656682484314289

As part of the Nomis migration work, we need to receive and send traffic to/from another FixNGo CIDR range: 10.40.128.0/20 please. We'll need two way traffic between this range and the hmpps-production VPC range.

This ticket is to work with @julialawrence to establish the required connectivity for Nomis. This will likely include new TGW routes and NACLs, the analysis work on this is to be included in this ticket.

Value

Enable Nomis team to move forward with migration to the MP.

Questions / Assumptions / Hypothesis

Definition of done

• [ ] required connectivity is in place
• [ ] another team member has reviewed
• [ ] tests are green
• [ ] UR test OR added to continual research plan

Reference

How to write good user stories

[julialawrence]

An additional note: as part of this change, we'll need enabling of port 22 traffic inbound from FnG, both from old and new ranges as per https://mojdt.slack.com/archives/C01A7QK5VM1/p1656660772312919?thread_ts=1656511946.681849&cid=C01A7QK5VM1