Feature/support drush gt 8

[bomoko]

As described in #1787, the Lagoon UI sync tasks fail for newer versions of Drush because of the alias handling.

This builds on @mglaman's solution and includes the file sync task, which suffers from the same issue.

I've changed the logic slightly to only prefix the site alias when the lagoon:alias command is explicitly supported by Drush, since this is as good an indication as I can think of that the Drupal Integration modules is available.

This is only a short term fix - we will be deprecating these tasks and their corresponding API calls in the medium term.

Checklist

• Affected Issues have been mentioned in the Closing issues section
• Documentation has been written/updated
• PR title is ready for changelog and subsystem label(s) applied

Explain the details for making this change. What existing problem does the pull request solve?

Closing issues

Closes #1786

[tobybellwood]

tested ok:
for projects with drupal_integrations, it works as expected (#2911 excepted)
for projects without drupal_integrations it relies on coded aliases