Replace joi with zod

[TangoYankee]

Description

We are using the validationSchema parameter in the Config Module in conjunction with joi js. However, the rest of our tooling uses Zod for validation. To consolidate dependencies, let's move to using the Config validate function with Zod.

Acceptance criteria

• validation schema parameter is removed from config
• a custom validate function with Zod enforces the same values
• Joi is removed as a dependency