Probably best reviewed commit by commit.
I also split UppyFile into two intefaces distinguished by the `isRemote`
boolean:
- LocalUppyFile
- RemoteUppyFile
Also:
- Removed the TagFile type
- Don't re-upload completed files - fixes#5930
- Clean up stored files on `complete` event *only* if *all* files
succeeded (no failed files). this allows the user to retry failed files
if the browser & upload get interrupted - fixes#5927, closes#5955
- Only set `isGhost` for non-successful files. it doesn't make sense for
successfully uploaded files to be ghosted because they're already done.
#5930fixes#6013
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Co-authored-by: Prakash <qxprakash@gmail.com>