fix(graph): adding the same user as multiple members in a group (#3354)

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* make sure the list of members to add to a group is unique, by
   removing duplicates in the inbound list of member IDs

 * not attempting to detect duplicate DNs as that should not be
   necessary, and results in an error with OpenLDAP; the built-in IDM
   does not catch those as of now but the issue is tracked there, and
   should not happen due to the UUID filtering in this commit

 * remove the corresponding failing test from the list of expected
   failures

Fixes 3354

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