fix(integrations): add SupportedFileTypes to files for 3.25 support

[rmitchellscott]

OS version 3.25 expects a supportedFileTypes array on each IntegrationFile in the folder listing response. Without it, file counts in folders are listed as 0, and the PDF/ePUB import fails with "No shared import format"

I've also stripped the . from the fileType to match the official server response.

Tested on 3.25.1.1 and 3.24.0.149.

Closes #427

[rmitchellscott]

@ddvk not sure what your usual release schedule is. This one would be nice to get released as it's a fix for an rM version that's been out for over a month.

[ddvk]

there is no schedule, just whenever someone pokes me.