feat: load scaling-relation centres + luminosities from CSV via galaxy_table

[Jammy2211]

Summary

Adds CSV-driven loading of galaxy centres + luminosities to the scaling_relation tutorial scripts using the new al.galaxy_table_from_csv / al.galaxy_table_to_csv helpers shipped in PyAutoGalaxy#393 + PyAutoLens#502.

Both modeling.py files show two equally-supported flows side by side so users see they have a choice:

• Option A (default): CSV via al.galaxy_table_from_csv -- scales naturally to populations of tens or hundreds of galaxies, single editable file as source of truth.
• Option B (commented out): JSON centres + hardcoded luminosity list -- the original API, fine for short fixed-length tutorials.

modeling_for_luminosities.py now writes its fitted luminosities directly to scaling_galaxies.csv -- the same file modeling.py consumes via Option A -- so the two scripts chain end-to-end with no manual copy/paste.

Closes PyAutoGalaxy#392.

Scripts Changed

• scripts/imaging/features/scaling_relation/simulator.py -- emits extra_galaxies.csv and scaling_galaxies.csv alongside the centre JSONs (truth-value luminosities written by the simulator, kept in sync with the simulated tracer).
• scripts/imaging/features/scaling_relation/modeling.py -- adds Option A (CSV via al.galaxy_table_from_csv, default) and Option B (JSON + hardcoded list, commented out) for the scaling-relation tier; updated header docstring and prose.
• scripts/group/features/scaling_relation/simulator.py -- same as imaging simulator: emits extra_galaxies.csv and scaling_galaxies.csv for the three-tier dataset.
• scripts/group/features/scaling_relation/modeling.py -- same Option A / Option B side-by-side for the scaling tier; updated section header and prose.
• scripts/group/features/scaling_relation/modeling_for_luminosities.py -- switches output from scaling_galaxies_luminosities.json to scaling_galaxies.csv via al.galaxy_table_to_csv, so the chain to modeling.py needs no manual paste. Drops unused import json.

Upstream PRs

• feat: add galaxy_table CSV reader/writer for galaxy populations PyAutoGalaxy#393 -- galaxy_table module + tests
• feat: re-export galaxy_table CSV helpers from autogalaxy PyAutoLens#502 -- companion namespace re-exports

Test Plan

• python -m py_compile clean for all 5 scripts.
• Both simulators run end-to-end and emit the expected extra_galaxies.csv + scaling_galaxies.csv (CSV contents inspected -- schema y, x, luminosity with truth values from the simulator).
• Both modeling.py files run TEST_MODE=2 cleanly (likelihood function called once with prior means; structure verified).
• modeling_for_luminosities.py runs TEST_MODE=2 cleanly and writes a valid scaling_galaxies.csv (the chain-point file).
• scripts/check_sizes.sh clean.
• Smoke tests pass.

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