[Backport] Create ability to set is_visible_on_front to order status history comment

[ronak2ram]

Original Pull Request

#15637
Create ability to set is_visible_on_front to order status history comment.

Description

The parameter is_visible_on_front is able to be set from the admin, but not from addStatusHistoryComment of the order model. This would provide the ability to set this value from custom code such as event observers.

Manual testing scenarios

1. Call ->addStatusHistoryComment($comment, false) to not set is_visible_on_front (backwards compatible with no extra param)
2. Call ->addStatusHistoryComment($comment, false, true) to set is_visible_on_front
3. Call ->addStatusHistoryComment($comment, false, false) to not set is_visible_on_front

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 @ronak2ram. Thank you for your contribution.
We will aim to release these changes as part of 2.1.15.
Please check the release notes for final confirmation.