Spoke Data Management: Deleting and OverwritingProjects Uploaded as GLB

[mikemorran]

Describe the bug It is a well documented issue that there is no method to delete a .glb project in spoke: https://github.com/mozilla/Spoke/issues/1146

In addition, when replacing a .glb file, existing files are not removed from the db, leading users to accumulate more and more data as they update and iterate on their scenes.

Expected behavior Replacing .glb files in existing projects should remove the existing files completely from the db. There should also be a method to delete a .glb project entirely and its associated files

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