Integrate test from `fastify-cors`

### What is the problem this feature would solve?

Increase test and security

### What is the feature you are proposing to solve the problem?

Integrate test (https://github.com/fastify/fastify-cors/tree/master/test) from [@fastify/cors](https://github.com/fastify/fastify-cors).

### What alternatives have you considered?

_No response_