Integrate cuopt QP and SOCP

[Iroy30]

Fixes # .

Summary/Motivation:

The cuOpt direct solver plugin (cuopt_direct.py) previously supported linear and MIP models only. cuOpt 26.06 exposes APIs for quadratic objectives and second-order cone constraints expressed as quadratic inequalities. This PR extends the Pyomo cuOpt interface so users can solve QP/SOCP models through SolverFactory('cuopt').

Changes proposed in this PR:

• cuopt_direct.py: Add quadratic objective support (_set_objective, _build_quadratic_objective_csr); add quadratic constraint support (_add_cuopt_quadratic_constraint, COO helpers)
• test_cuopt_direct.py: Add tests for quadratic objective matrix layout, SOC constraint build + solve
• test_qp.py: Add cuOpt to the cross-solver QP regression suite (test_qp_objective_cuopt_model
• solvers.py: Register quadratic_objective and conditional quadratic_constraint in the cuOpt test case capabilities.

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