[22.05] Send composite datasets directly to tusUpload

[jdavcs]

Fixes #14125.

If the data contains a file or is a composite dataset, send it directly to tusUpload(), otherwise attempt to handle the pasted content on the client depending on what that pasted content is.

I couldn't figure out a way to handle the parts of a composite dataset on the client depending on what they are. A composite dataset may consist of any combination of a file, a pasted url(s), and pasted non-url content (unlikely, but not impossible). Any files are stored at data.files and are already handled by tus - so no problem there. Any non-file items are stored in the data.targets[0].target.items[0].composite.items array and are identified as: src=pasted for non-url pasted content and src=url for url pasted content. I tried iterating over this array and handling each item separately - which, of course, resulted in 3 separate composite datasets. So, I've opted for the simple solution: if it has files or is a composite dataset, don't try to handle pasted content with tus.

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[mvdbeek]

Can you write selenium tests for the possible combinations ?

[mvdbeek]

It would still be nice to get a test here, but this works.

[jdavcs]

@mvdbeek yes, I'll have the tests sometime today - almost done with them!