Fix(service): re-enable index counts

[SHAcollision]

The main issue faced currently is that user_counts() graph query does not agree with indexed counts. I believe indexed counts is right, but modifying the user_counts() get query to count total given tags without impacting perf seems hard.

Index: 4

Graph: 2

On a reindex, the index count will start mixing "total tags" and "total distinct labels".

Tried modifying `user_counts() with something like this to no effect.

// Collect outgoing relationships to Users
        OPTIONAL MATCH (u)-[rel_u_user:FOLLOWS|TAGGED]->(other_user:User)
        WITH u,
            sum(CASE WHEN type(rel_u_user) = 'TAGGED' THEN 1 ELSE 0 END) AS user_tags,
            collect(rel_u_user) AS rels_u_user

        // Collect incoming relationships from Users and count tagged
        OPTIONAL MATCH (user_to_u:User)-[rel_user_u:FOLLOWS|TAGGED]->(u)
        WITH u, user_tags, rels_u_user,
            sum(CASE WHEN type(rel_user_u) = 'TAGGED' THEN 1 ELSE 0 END) AS tagged,
            collect(rel_user_u) AS rels_user_u
            ```
Ideas @tipogi ?
# Pre-submission Checklist

> For tests to work you need a working neo4j and redis instance with the example dataset in `docker/db-graph`

- [ ] **Testing**: Implement and pass new tests for the new features/fixes, `cargo test`.
- [ ] **Performance**: Ensure new code has relevant performance benchmarks, `cargo bench`