Remove isDev guard check for resendApiKey (contingent on resend/domain registration on Resend)

[henrylee746]

Description

Once domain is verified in Resend dashboard, e.g.:

We can remove the isDev check based off NODE_ENV:

as we can assume email verification will work in dev environments as well (although you can only send emails from the onboarding/the resend-registered email to the registered email)

Suggested Solution