fs/unicode patches for v5.9

This includes 3 patches for the unicode system for inclusion into
Linux v5.9:

  - A patch by Ricardo Cañuelo converting the unicode tests to kunit.

  - A patch from Gabriel exporting in sysfs the most recent utf-8
    version available.

  - A patch from Gabriel fixing the build of the kunit part as a module.

  - A patch from Alexander updating documentation web links.
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