MLPAB-2740 - implement the firewalled network

[andrewpearce-digital]

Purpose

Manage egress from the network and limit to specific endpoints

Fixes MLPAB-2740

Approach

• Use fire walled network module in place of network module

Learning

• https://github.com/ministryofjustice/opg-terraform-aws-firewalled-network
• https://docs.aws.amazon.com/network-firewall/latest/developerguide/suricata-examples.html#suricata-example-domain-filtering

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.87%. Comparing base (a46728e) to head (b142a02).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1664   +/-   ##
=======================================
  Coverage   94.87%   94.87%           
=======================================
  Files         282      282           
  Lines       15601    15601           
=======================================
  Hits        14801    14801           
  Misses        630      630           
  Partials      170      170           

Flag	Coverage Δ
unittests	94.87% <ø> (ø)

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