Enable show relevant organisations feature flag

[stephencdaly]

What problem does this pull request solve?

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

Enable the feature flag that limits the organisations that new users can select based on their email address in production.

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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

Enables the show_relevant_organisations feature flag in the production Terraform variables so that new users only see organisations relevant to their email domain when selecting an organisation.

Changes:

• Set forms_admin_settings.show_relevant_organisations = true in production tfvars.

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