feat: make it possible to disable NewRelic globally

[regisb]

By defining the ENABLE_NEW_RELIC='false' environment variable, the new relic
logging integration will be disabled, which is a must-have for most non-edX
platforms.

Close openedx/wg-frontend#14

cc @davidjoy.

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[natabene]

@regisb Thank you for your contribution. We will review this as soon as we can.

[manny-m]

👍

[regisb]

Thanks for the reviews! Can we merge this and make a release? We will then have to upgrade frontend-build in the account, ecommerce gradebook, learning, payment, profile MFEs.

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