Automatically update InvokeHTTP Proxy configuration properties

Users updating from 1.x are finding that InvokeHTTP is failing because the "Proxy Type" property that was previously defined no longer is. As a result, InvokeHTTP treats it as a header and attempts to send it as an HTTP Header. However, since it has a space in the name, it's invalid and InvokeHTTP fails.

We should automatically handle migrating the Proxy properties to make this seamless.