feat(console): Emails for purchase and failed payments

[poolsar42]

Description

Sends emails for customers when there's an:

• an issue with current payment option
• purchase has been made with all info about the purchase

Related Issues

• Closes feat(console): Emails for purchase and failed payments #2485

Testing

To test

• successful payments: just buy entitlement in dev environment
• failed payments:
  1. Hardcode email address in webhook.ts in invoice.payment_failed case in switch block.
  2. trigger this event with stripe CLI like stripe trigger invoice.payment_failed
     2a. It is also possible to trigger this event for specific customer as this: stripe trigger invoice.payment_succeeded --override payment_method:customer=cust_123 --override invoiceitem:customer=cust_123 --override invoice:customer=cust_123
     2b. Similarly it is possible to do stripe trigger invoice.payment_failed --override payment_method:customer=cust_123 --override invoiceitem:customer=cust_123 --override invoice:customer=cust_123

Explanation for this CLI commands.

Checklist

• I have read the CONTRIBUTING guidelines
• I have tested my code (manually and/or automated if applicable)
• I have updated the documentation (if necessary)