Enable audit-filter for npm dependencies for all packages in monorepo

[jaredhirsch]

Related to #2228 and inspired by the checklist item in #1128, let's make sure transitive dependencies are up-to-date across the whole monorepo. Copying in the checklist item from #1128 for guidance, and adding checkboxes for each package within the monorepo:

Packages with npm audit --json integrated into testing via a lint:deps npm task:

• 123done
• browserid-verifier
• fxa-auth-db-mysql
• fxa-auth-server
• fxa-basket-proxy
• fxa-content-server
• fxa-customs-server
• fxa-email-event-proxy
• fxa-email-service
• fxa-event-broker
• fxa-geodb
• fxa-js-client
• fxa-payments-server (chore(payments): add npm auditing to payments-server dependencies #1896)
• fxa-profile-server
• fxa-shared
• fxa-support-panel ([Support Integration] Security Checklist #741)

Security guidance for reference:

• enable security scanning of 3rd-party libraries and dependencies
  • For node.js, use npm audit with audit-filter to review and handle exceptions (see example in speech-proxy)
  • For Python, enable pyup security updates:
    • Add a pyup config to your repo (example config: https://github.com/mozilla-services/antenna/blob/master/.pyup.yml)
    • Enable branch protection for master and other development branches. Make sure the approved-mozilla-pyup-configuration team CANNOT push to those branches.
    • From the "add a team" dropdown for your repo /settings page
      • Add the "Approved Mozilla PyUp Configuration" team for your github org (e.g. for mozilla and mozilla-services)
      • Grant it write permission so it can make pull requests
    • notify secops@mozilla.com to enable the integration in pyup