Replace lookupproxy api

Resulting from https://gitlab.developers.cam.ac.uk/uis/devops/iar/backend/merge_requests/87, removing lookupproxy means that some functionality used by the frontend (particularly institutions) is now missing.

Related to https://gitlab.developers.cam.ac.uk/uis/devops/iar/backend/issues/93

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assigned to @rjw57

unassigned @rjw57

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mentioned in issue #174 (closed)

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marked this issue as related to #176 (closed)

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Now part of https://gitlab.developers.cam.ac.uk/uis/devops/iar/backend/issues/97

closed

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