[Deliverable] Migrate Logos Delivery to LEZ-based RLN using the RLN membership management module

[jm-clius]

Owner: AnonComms Zerokit-RLN (primary), Logos Delivery (support)

FURPS:

• U2. Logos Delivery and Chat can use the service to obtain RLN memberships
• U5. Logos Delivery uses the basic RLN membership management module and LEZ-based RLN for all membership acquisition and management

Checklist:

• Code: link to GitHub issues/PRs/Epic
• Dogfood: link to dogfooding session/artefact
• Docs: links to README.md or other docs