Description/Context

We stopped taking payments on micromasters.mit.edu in 2021 when we moved the DEDP program to mitxonline. We are no longer using Cybersource with this app and can now safely remove all references and code related to its use.

Plan/Design

• the app should start even if the Cybersource settings are empty or absent
• remove ecommerce code
• don't disturb the data
• another PR should be submitted to remove all Cybersource references here