test: add TAS simple level and constraint tests

Add 5 tests for simple topology constraint scenarios:
- SL1: PCS-only constraint (inherited by children)
- SL2: PCSG-only constraint
- SL3: No topology constraints (baseline)
- PC1: Host-level constraint (strictest packing)
- ZL1: Zone-level constraint

These tests verify constraint behavior at different
resource levels (PCS, PCSG, PCLQ) and topology domains
(zone, rack, host, none).

Builds on PR #348 (infrastructure).

Signed-off-by: Ron Kahn <rkahn@nvidia.com>

Author: Ronkahn21