Remove unmanaged layer on flows before import

[ewingjm]

Is your feature request related to a problem? Please describe

Updates to flows do not apply when importing managed solutions because the unmanaged layer includes the clientdata property (which includes the entire flow definition) when the connections are set .

Describe the solution you'd like

Use the RemoveActiveCustomizations function to delete the unmanaged customisations layer for any flows in the solutions.

Additional context

This only appears to be an issue for flow that have been connected by hand in the past. Flows connected/activated through the template do not have any unmanaged layer after deployment.

[ewingjm]

Just added the additional context. Seems like it's not as big of an issue as I thought but might still be worth having it in there.