[Forwardport] fix: set message-success in setup if we already have the latest version

[DanielRuf]

Original Pull Request

#15012

Description

Currently the upgrade check in the setup uses message-error even if we already have the latest version.

how it currently is:

how it should be:

Logic wise it should be message-success in this case instead of message-error as this is not an error and is not what we expect from the UX perspective.

Manual testing scenarios

1. update Magento 2 to the latest version
   2.open the upgrade check in the setup

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 @DanielRuf. Thank you for your contribution.
Changes from your Pull Request will be available with the upcoming 2.3.0 release.