Remove GraphQL type and resolver for Network Policies
What does this MR do and why?
This change removes unneeded and deprecated fields and resolvers from GraphQL API for Network Policies.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #352285 (closed)