Remove billing support email

[jingcheng16]

Ticket: https://dimagi-dev.atlassian.net/browse/SAAS-14988

Environments Affected

All env will be affected: Staging, India, Swiss, Production

This is already deployed to staging.

I will run update-config, and restart service, to india, swiss and production, after this PR is approved and merged.

[millerdev]

FYI @dannyroberts, you may need to update mail filters for this.

[dannyroberts]

Thanks. But also, eh, this "environment" is defunct anyway. Can probably just remove it entirely.

[gherceg]

I will run update-config, and restart service, to india, swiss and production

You may already know this but honestly this is also to clarify my own understanding - I think service commcare restart will need to be scheduled during maintenance hours for production (via the maintenance feed). I believe it is true that this command doesn't disrupt services since it is a rolling restart that doesn't impact formplayer machines, but as an extra precaution we still want to schedule it during maintenance hours. @dannyroberts or @millerdev does that sound right to you?

[dannyroberts]

I'll offline with you @gherceg about rollout procedures