Verify Level-2 workspace reservations

[Chi Lo (chilo-ms)]

PR stack

1. Add workspace estimation accounting and reporting #31962 - Level-1 workspace estimation and reporting
2. Verify Level-2 workspace reservations #32189 - Level-2 reservation verification
3. Integrate CUDA workspace with activation memory patterns #32071 - activation-aware CUDA workspace preallocation

This is the middle PR. Please review it relative to chilo/workspace-estimation-logging; it contains one stack-specific commit.

Summary

• retain accepted per-node workspace reservations after graph partitioning;
• compare post-kernel-creation Level-2 declarations with the reservation used by partitioning;
• report larger, equal, smaller, missing-declaration, and missing-reservation counts and bytes;
• warn by default when Level 2 exceeds the reservation;
• optionally fail session initialization with session.strict_workspace_verification=1.

Scope

This PR verifies the partitioning contract after kernels are created and prepacked. It does not repartition the graph or change runtime workspace allocation. Static preallocation is the next PR in the stack (#32071).

Validation

• onnxruntime_test_all Debug build passed.
• ResourceAccountantTest.* and RealAccountantTest.*: 18 tests passed.