Reduce GraphQL query complexity for security inventory query

Overview

The security inventory GraphQL query is exceeding the complexity limit and needs to be optimized.

Query to optimize:

• ee/app/assets/javascripts/security_inventory/graphql/subgroups_and_projects.query.graphql (complexity: 340)

Suggested approaches:

1. Remove unused fields from the query
2. Split the query into multiple simpler queries
3. Optimize resolver complexity calculations

Related

• MR: !213762 (merged) - Add test for graphql query complexity
• Issue: #581051 (closed)