feat: Add ability to scale up single-node to multi-node and vice versa

[chris-gooch]

Description

Add the ability to scale up from single-node cluster to multi-node cluster and vice versa.
Fixes #1521

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• Tests have been added/modified and all tests pass.
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.
• Documentation has been updated or added where necessary.

Additional Context

Create new single-node cluster then:
Scale up from 1 to 3 = OK
Scale down from 3 to 1 = OK
Create new 3 node cluster = OK