Do we still need to support importing from fedora 5 to fedora 6?

[joshdentremont]

In the makefile, the fcrepo import command runs fcrepo-upgrade-utils if FEDORA_6 is set to true in your .env. This is only necessary if the export you are using came from a version older than fedora6. At the moment this is causing some errors and stopping the import from working.

I have an issue in for buildkit to update fcrepo-upgrade-utils, which should stop this error (Islandora-Devops/isle-buildkit#304), but in conversation with Jared, he said that we don't need to run this on imports coming from fedora6. (https://islandora.slack.com/archives/CM6F4C4VA/p1700229939782089?thread_ts=1700076858.075639&cid=CM6F4C4VA)

I'm wondering if we can remove that check in the Makefile now, to stop this from being a problem again in the future as we continue to upgrade fedora? This would only be a change to the Makefile, and if someone was trying to import from 5 to 6 they would just have to add their own makefile commands manually.

[joshdentremont]

Based on conversation at tech call we determined this should be removed, but we should make a note for anyone importing to fedora 6 from an older version, or have separate make commands for fedora 6 and fedora 5.

#369 should solve this by adding new import and export commands, and renaming the old ones to still be available for anyone using fedora 5, or needing to upgrade from 5 to 6.