Change Correos environment variables

• Use pre instead of test:

In the CorreosPreRegistro library, the term used to check if is production or preproduction environment is pre instead of test

https://git.coopdevs.org/coopdevs/som-connexio/correos/correos-preregistro/-/blob/main/correos_preregistro/client.py#L44

• Use CORREOS_ENVIRONMENT instead of CORREOS_ENV
• Set the Código etiquetador in production env