Remove copy of answers feature flag

[stephencdaly]

What problem does this pull request solve?

Trello card: https://trello.com/c/EAwRqQMh

This feature flag no longer exists in the app code, so the terraform to set the environment variable can be removed.

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• Ensure that you consider the wider context.
• Does it work when run on your machine?
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• Do the commit messages explain why the changes were made?
• Are there all the unit tests needed?
• Has all relevant documentation been updated?

Reminders

If you've made changes to the deployer role (files in modules/deployer-access):

• Remember to run make <environment> forms/account apply on the relevant environments (dev, staging and/or prod)
• Check the #govuk-forms-deployment-notifications Slack channel to ensure the apply-forms-terraform-<environment> pipelines have run successfully

[Copilot]

Pull request overview

Removes Terraform configuration for the deprecated “copy of answers / send filler answers” feature flag from the forms-admin deployment, since the application no longer consumes this setting.

Changes:

• Removed the send_filler_answers module input variable from infra/modules/forms-admin.
• Removed the SETTINGS__FEATURES__SEND_FILLER_ANSWERS ECS environment variable wiring.
• Removed send_filler_answers from forms-admin settings inputs and all environment tfvars (dev/staging/production).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
infra/modules/forms-admin/variables.tf	Removes the send_filler_answers variable definition from the module interface.
infra/modules/forms-admin/main.tf	Removes the ECS task env var entry for SETTINGS__FEATURES__SEND_FILLER_ANSWERS.
infra/deployments/forms/tfvars/dev.tfvars	Removes the send_filler_answers setting from dev config.
infra/deployments/forms/tfvars/staging.tfvars	Removes the send_filler_answers setting from staging config.
infra/deployments/forms/tfvars/production.tfvars	Removes the send_filler_answers setting from production config.
infra/deployments/forms/inputs.tf	Updates the forms_admin_settings object type to drop send_filler_answers.
infra/deployments/forms/forms-admin/main.tf	Removes passing send_filler_answers into the forms_admin module.

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