Change policy to also allow removal of emails from the suppression list

[jsf9k]

🗣 Description

This pull request adds permissions to the SesSendEmail-cyber.dhs.gov role to allow removal email addresses from the email suppression list.

💭 Motivation and Context

This change allows one to remove addresses from the email suppression list via the AWS CLI:

AWS_PROFILE=cool-dns-sessendemail-cyber.dhs.gov AWS_SHARED_CREDENTIALS_FILE=~/.aws/production_credentials AWS_DEFAULT_REGION=us-east-1 aws sesv2 delete-suppressed-destination --email-address user@example.com

We have found that removing addresses this way is preferable to removing them via the web UI, since the web UI gives no information as to whether the address was originally on the suppression list of not.

🧪 Testing

I have deployed these changes to our COOL production environment and successfully removed an email from the email suppression list.

🚥 Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (causes 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.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.