Add weekly_submission_emails_enabled feature flag

[stephencdaly]

What problem does this pull request solve?

Trello card: https://trello.com/c/6ebxtzqO

Add weekly_submission_emails_enabled feature flag for forms admin.

Enable on dev and staging. We're enabling on staging as this feature does not affect any end-to-end tests and we want to reliably be able to test this even if people push up work in progress changes to dev.

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• Ensure that you consider the wider context.
• Does it work when run on your machine?
• Is it clear what the code is doing?
• 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, user-research, 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

Adds a weekly_submission_emails_enabled feature flag to the Forms Admin infrastructure configuration, enabling weekly submission batch emails to be toggled per environment.

Changes:

• Introduces a new weekly_submission_emails_enabled boolean variable to the forms-admin Terraform module.
• Wires the flag into the ECS task definition as SETTINGS__FEATURES__WEEKLY_SUBMISSION_EMAILS_ENABLED.
• Sets the flag to true in dev and staging tfvars (and false elsewhere).

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
infra/modules/forms-admin/variables.tf	Adds the new feature-flag input variable.
infra/modules/forms-admin/main.tf	Exposes the flag to the running app via ECS environment variable.
infra/deployments/forms/tfvars/dev.tfvars	Enables the flag in dev.
infra/deployments/forms/tfvars/staging.tfvars	Enables the flag in staging.
infra/deployments/forms/tfvars/user-research.tfvars	Sets an explicit false value for schema completeness.
infra/deployments/forms/tfvars/production.tfvars	Sets an explicit false value for production.
infra/deployments/forms/inputs.tf	Extends forms_admin_settings object type to include the new flag.
infra/deployments/forms/forms-admin/main.tf	Passes the new settings value through to the forms-admin module.

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