Address scope peculiarities within search/find functionality of projectmgr

Currently the search/find functions in the projectmgr component also retrieves projects a user is not a participant in. This is especially critical regarding projects with scope 'WES_PRIVATE - private' or 'WES_CONFIDENTIAL - confidential'.

These project may only be search for/found by users that are exlicit participants of the projects. This over ruless the generic permissions of 'PROJECTMGR_ADMIN' or 'PROJECTMGR_VIEW'.