MLPAB-2748 - Check egress via network firewall

[andrewpearce-digital]

Purpose

Ensure that requests not permitted by the allow list are dropped

Fixes MLPAB-2748 MLPAB-2775

Approach

• write a script to make a request for an address not on the allow list
• build an egress checker image
• deploy lambda function to check egress if enabled

Learning

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.97%. Comparing base (2879dc9) to head (c25239c).
Report is 22 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1678   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files         285      285           
  Lines       16145    16145           
=======================================
  Hits        15334    15334           
  Misses        641      641           
  Partials      170      170           

Flag	Coverage Δ
unittests	94.97% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.