Update Platform To Use lab_code_1 Instead of collecting_institution

[Aberdur]

PR Description

• Persist lab_code_1 on core.Profile and expose helpers that always return a valid string (auto-populating from the lab catalogue when needed)
• Refactor collectors’ access control (get_available_samples_for_user, intranet views, search table, dash selectors) to filter by lab_code_1, falling back to the legacy name only when a code is missing
• Rework pre-processing pipelines (samples_per_date_all_lab_detailed, search_samples_summary) and their consumers to serialise datasets keyed by lab_code_1, while keeping collecting_institution as display metadata.
• Update API endpoints (create_sample_data, check_sample_exists) so collecting_institution_code_1 is the authoritative identifier; derive and normalise collecting_institution via ensure_lab_display before fingerprints are computed
• Extend the lab utilities (core/utils/labs.py, core/utils/plotly_dash_graphics.py) to provide structured dropdown options (value=lab code, label=resolved name) and ensure dashboards remain functional even when only the legacy name is available