perf(neo4j): Improve currentUser read performance

Created by: Tirokk

Authored by roschaefer Mar 4, 2020 Merged Mar 5, 2020

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🍰 Pullrequest

This is a

• small refactoring, we want to keep all graphql in the frontend under graphql
• performance improvement, because we don't query for expensive user counts and avoid N+1 queries
• hopefully a fix for our user who receives 504 timeout for currentUser query.

Issues

• fixes #3208 (closed)

Todo

• None