fix(graph): Allow to combine $search and $filter in users query

This fixes the 'graph/v1.0/users' endpoint to allow a combination of a
memberOf filter in $filter with a search string in $search.

Allowing queries like:

$filter=(memberOf/any(m:m/id eq 509a9dcd-bb37-4f4f-a01a-19dca27d9cfa))&$search="example"
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f