Email approvers when we have a new user request to join orgs

[amandazhuyilan]

Description

AAI-127: Email approvers when we have a new user request to join orgs

Changes

-Send email to approvers on new BPA user registration

• Add EmailService using AWS SES
• Mocks email sending in tests
• Approver email made configurable
• AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY added as Github action secrets

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have added unit / integration tests that prove my fix is effective or that my feature works
• I have run all tests locally and they pass
• I have updated the documentation (if applicable)

How to Test Manually (if necessary)

All unit tests shall pass.

Sample email here:

[marius-mather]

Looks good overall but I think the actual email sending should occur in a separate function, and ideally a background task, rather than as part of the main registration function.

[marius-mather]

Looking really good overall - just one suggestion re: making sure we move all the email-related work into the background task.

[marius-mather]

Looks great, thanks!