3036368 - Move Message Clearing to Before Source Plugin is Invoked

This must happen before prepareRow() so that we do not lose non-fatal messages emitted by the source plugin (like the one in \Drupal\field\Plugin\migrate\source\d6\Field).

Closes #3036368

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• 4ef3931e - Fix coding standards

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• f9d97adf - Revert "3036368 - Fix PHP Notice in `\Drupal\migrate\Row::changed`"
• 24223114 - 3036368: Use snake_case for regular variables
• 517be875 - 3036368: Remove redundant condition
• 6a2c5bcb - 3036368: Use snake_case for another variable
• 23cc4427 - 3036368: Fix a mock object in another test

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• 8512d186 - 3036368: Defer message deletion instead of deleting and restoring

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