ISTWCMS-4494: remove note field from related links block as it was WCMS 2-specific

Kevin Paxmanrequested to merge
feature/ISTWCMS-4494-kpaxman-remove_note into 8.x-1.x

Confirm that the note is gone on a clean install.

Confirm that there are no errors on any pages that may have referenced the note.

Confirm that there are no stray references to the note in code.

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