Remove the use of window in the cross platform ReportScreen component

[neil-marcellini]

Problem

Coming from this comment #9031 (comment)

We really shouldn't be seeing window unless we are in an index.js file and there's an index.native.js that is doing a no-op.

Solution

create a small lib that returns something like VisualViewport we can call addEventListener() on and for mobile it would just return an empty function.

See #9031 (comment)