Duplicate Order Confirmation Emails for PayPal Express checkout order

[rocketweb]

Description

Duplicate Order Confirmation Emails PayPal

Fixed Issues (if relevant)

Manual testing scenarios

1. Configure payment method PayPal Payments Pro with Express Checkout
2. Set Payment Action = Sale
   Basic Settings - PayPal Payments Pro -> Payment Action = Sale
   Basic Settings - PayPal Express Checkout -> Payment Action = Sale
3. Go to frontend, create order with Express Checkout

Actual result

Customer gets two Order confirmation emails

Expected result

Customer should get one Order confirmation email

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[ishakhsuvarov]

Hi @rocketweb @syzovao
Could you please sign Contributor License Agreement (CLA) with the github account you have used for the commit in this PR? You may use link in the comment above to sign.

Thank you

[ishakhsuvarov]

Thank you for signing!

[magento-engcom-team]

Hi @rocketweb. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.2.5 release.