feat(TMD-770): Newsletter components not working

[amerkadicE]

Description

Move Newsletter subscribe components from graphQL mutation to api proxy TMD-770

Checklist

• [ ] Have you done any manual testing?
• [ ] Does it have automated tests?
• [ ] Do you need any other PRs merged before this (if so please list)?
• [ ] Do you need to update the README/Runbook
• [ ] Have you checked for accessibility?

Screenshots (if appropriate):

Include screenshots if needed.