Add error logging to SystemNoteService#create_note when a note is not created

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SystemNoteService#create_note should log an error when it fails to create a note.

The method should still return the note, so callers can handle the failure further if they need to.

This idea was raised in !19990 (comment 243721291) where the question of what could be done if SystemNoteService#create_note does not create a note was asked.