Psaxton 46 dedup list of files with todo/fixm es

This MR fixes a couple of issues regarding Merbocops notes on TODO and FIXME comments in touched files. The first change, removes duplicate file names which can occur when listing touched files. The second fixes the case when a list of files longer than 3 elements the list is truncated with "And there is X more." This MR will replace "and there is 1 more" with the name of the file in the case that the list is 4 files long.