fix: newsletter email verification subscription

[johnson-oragui]

This pull request solves the previous situation where no email is sent to a user when they subscribe to newsletter. ​

Description

This pull request solves the previous situation where no email is sent to a user when they subscribe to newsletter. With this fix, emails are now been sent to users on newsletter-subscriptions.

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Related Issue (Link to issue ticket)

newsletter subscription email

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Motivation and Context

Users need to get a confirmation email on or after subscribing to a newsletter.

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How Has This Been Tested?

This has been tested with pytest and postman.

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Screenshots (if appropriate - Postman, etc):

​EMAIL IS SENT TO USER

EMAIL IS RECEIVED BY THE USER

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change) ​

Checklist:

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.