Include nodes for import that are missing supplementary files #11651
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Summary
When calculating nodes to import, only nodes that aren't available are included. However, a node is considered available if it's only missing supplementary files, so only nodes that aren't missing files should be filtered out of the import data.
References
Discussed on Slack with @rtibbles. What we're trying to do is mirror channels from Studio so that we can use it as a local cache when building OS images that contain preloaded Kolibri content. However, sometimes our channels have missing files despite repeatedly trying to import them from Studio. We tracked this down to supplementary files (thumbnails) that aren't being pulled from Studio when a channel is already present on the cache server.
Reviewer guidance
Import a channel and content, delete a thumbnail file, scan the content so it gets marked as unavailable, then import the channel content again. The thumbnail won't be downloaded again.
Testing checklist
PR process
Reviewer checklist
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