Content export filenames should include the CourseKey or LibraryKey

[ormsbee]

Course exports are currently generically named like course.qxdrkccd.tar.gz. This can be confusing for people who interact with multiple course runs. We can change this to include the CourseKey/LibraryKey and version in the name itself, e.g. Axim__Platform_Intro__2023Q1__2023-09-21-145320.qxdrkccd.tar.gz

Still need to work out a few details about the precise naming, whether to include last-modified date for sorting purposes, etc.

[github-actions]

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