API Endpoint - Health - Spec and impelementataion

**Description**

There is no endpoint to check if the instance is in good condition

We need to prepare the change to the API specification and then implement this change.

More information about API Endpoints:
https://github.com/apache/airflow/issues/8118

**Use case / motivation**

N/A

**Related Issues**

N/a