Add missing dependency data sources and reusable ref outputs

[grubmeshi]

Context: To support data-source-first wiring in examples and real modules, several dependency lookups still require hardcoded identifiers or ad-hoc expressions.

Gaps:

• Missing data sources: meshstack_location, meshstack_workspace_group_binding, meshstack_workspace_user_binding.
• Missing singular/plural parity in a few domains.
• Missing reusable read-only ref-style outputs on some resources/data sources where cross-resource wiring currently needs metadata.uuid extraction.

Expected outcome:

• Add missing data sources where feasible.
• Add or standardize reusable computed outputs (ref and similar helper outputs) for cross-resource wiring.
• Update docs/examples to prefer these outputs over hardcoded identifiers.

Notes:

• Keep behavior backward compatible.
• Follow existing patterns like meshstack_workspace.ref, meshstack_tenant_v4.ref, and BBD version_latest / version_latest_release.