Use modules for sensitive WAF config #1666
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This uses a private module to create privates WAF resources and set private variables. These modules are defined in https://github.com/alphagov/terraform-govuk-infrastructure-sensitive (annoying had to use this name convention for TFC) .
As part of the tfc-configuration workspace, a sensitive variable set for WAFs is created for each environments.
Then for each of the govuk-publishing-infrastructure projects, they are configured to use the respective variable-set and to create the private WAF resource.
(tfc-configuration project needs to be run twice; once to create the variable set, then to assign it to the relevant projects. Hence will error on review of this PR.)