LG-10040 automate ial1 funnel report

[Sgtpluck]

🎫 Ticket

https://cm-jira.usa.gov/browse/LG-10040

🛠 Summary of changes

• Adds Reports::AuthenticationReport class that pulls details from from IdentityConfig.store.weekly_auth_funnel_report_config in order to create and email a weekly authentication funnel report for partners that opt-in.
• Adds a job to run Reports::AuthenticationReport weekly. (note: should this be dropped until we are able to test it? Since it won't run without any objects in the weekly_auth_funnel_report_config it felt safe, but could also follow the pattern of https://cm-jira.usa.gov/browse/LG-10836 of not adding the job until we've tested it in production)

Updated to make the email a little nicer in 13ff7ba

To test locally:

• add to your applications.yml file

  s3_reports_enabled: true
  weekly_auth_funnel_report_config: '[{"issuers": ["urn:gov:gsa:openidconnect.profiles:sp:sso:login-gov:identity-oidc-sinatra"], "emails": ["${YOUR_EMAIL}"]}]'

• open up a rails console with a prod connection
  aws-vault exec prod-power -- bundle exec rails c
• run the report
  Reports::AuthenticationReport.new.perform(Time.zone.now)
• wait a bit