add networking files for delete-account

[richgreen-moj]

A reference to the issue / Description of it

#6457

How does this PR fix the problem?

Creating networks for delete-account

Checklist (check x in [ ] of list items)

• I have performed a self-review of my own code
• All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

Additional comments (if any)

{Please write here}

[github-actions]

Please check the plan carefully before deploying these changes.

⚠️ Making changes to the environments-networks/*.json files will affect the networking of MP AWS accounts, in particular which VPC/Subnet is being shared in to which environment. For more guidance consult the documentation.

[github-actions]

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Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.5.0)
tflint will check the following folders:

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