Fix Python setup in plugin EP Python package/test pipeline jobs
- macOS/Windows: add setup-build-tools.yml to Python Package and Test jobs
- Linux: run Python packaging and testing inside Docker for manylinux compatibility and auditwheel support
- Windows: skip Python package/test jobs for arm64 (cross-compiled, can't run on x64 agents)
- Linux: add gpu_machine_pool parameter for test job pool