Backport 2.2 - Fix issue 17152 - prevent email being marked as not se…

[sambolek]

…nt if email copy fails due to exception

Description

Prevent email being marked as not sent if email copy fails due to exception.

---> Backport of #18288

Fixed Issues (if relevant)

1. Failure of "Send Order Email Copy" spams customers, every minute, forever. #17152 Failure of "Send Order Email Copy" spams customers, every minute, forever.

Manual testing scenarios

Provided inside reported issue

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-engcom-team]

Hi @sambolek. Thank you for your contribution.
We will aim to release these changes as part of 2.2.8.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.