## Context
Just cleaning up the `unifiedReplication` feature flag now that this is
fully rolled out
Also addresses some bugs that I came across while cleaning up,
specifically for the new home page
- Add enabled features flag check for read replicas in database
replication
- Infra diagram, read replicas
- View connection string CTA to open connect UI with the right database
selected
- Replaced all other actions with a "Manage replica" CTA which links to
the replica details page