feat(subplat): add support for free access program

[StaberindeZA]

Because

• Transfer ownership of the Mozilla VPN Free Access program to the SubPlat and EntPlat teams, which aligns with the goal of evolving the subscirption platform beyond subscriptions.
• Allow other Mozilla services to also utilize the Free Access Program.

This pull request

• Adds support for the Free Access Program, by broadcasting capabilities for enabled customers, even if they don't have a subscription.
• Read list of emails from Strapi and what capabilities should be provided to these users.
• On auth-server /profile query, return the relevant capability if the user email is in the list configured in Strapi.
• Add webhook listener to payments-api that listens for changes in Strapi and then calls an API in auth-server, which broadcasts capability added or removed via event-broker to RPs.
• Show Paid Subscriptions option to user that have access via a B2B subscription. On the subscription management page added a new section indicating services provided by the customers organization.

Issue that this pull request solves

Closes: PAY-3780

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• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).
• I have manually reviewed all AI generated code.

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