Add build_data.sh and CI consolidation roadmap

- Add build_data.sh: runs replay to generate test data
  - Fetches prepare_data_and_shm_dir.sh from common-ci-configuration
  - Auto-detects run_hived_img.sh location
  - Configurable stop-at-block and other options

- Add docs/ci-consolidation-roadmap.md documenting:
  - Current state of CI consolidation
  - Phase 1: Script consolidation (current)
  - Phase 2: Reusable YAML blocks (planned)
  - Phase 3: HAF app template expansion
  - Phase 4: Documentation and migration guides
  - Per-project migration priorities