TUI GraphQL methods

Added GraphQL methods to TUI client for approvals, tools, providers, and policy

Status: shipped | Area: ui | Published: 2026-03-23

Control impact: TUI now supports GraphQL alongside REST API for all operations.

ListApprovalsGraphQL - fetch approvals via GraphQL
ListToolsGraphQL - fetch tools via GraphQL
ListProvidersGraphQL - fetch providers via GraphQL
GetPolicyGraphQL - fetch policy via GraphQL
DecideApprovalGraphQL - decide approval via GraphQL