Removed renaming of output (demand only)

[dylanjmcconnell]

This PR removes functions that renamed the output file generated by the restructuring functions (but only for the demand trace data).

Background note

Renaming of the output parquet files is kind of unneccessary / not used since the release of V2 (which is when we moved to using the hive partitioning format). That is, the metadata contained in the renamed outputs isn't actually used / is a historical artifact of the previous approach (it also didn't hurt / didn't cause any problems to leave as is - so wasn't initially changed). It does introduce a pain point in migrating to the 2026 trace data, (and unnecessary to maintain) hence being actually removed now.

Summary

• Demand parser now writes <input_stem>.parquet instead of constructing a new filename from scenario/subregion/poe/demand_type metadata.
• write_new_demand_filename and get_save_scenario_for_demand_trace removed
  • (scenario mapping is now a one-liner in the restructure function).
  • Removed associated tests.
• Restructure function receives per-file metadata directly (no more all_input_file_metadata lookup inside function).
• Test data name changed (only name - contents identical).
  • tests/test_data/output/Green_Energy_Exports_RefYear2011_CNSW_POE10_OPSO_MODELLING.parquet → tests/test_data/output/CNSW_RefYear_2011_HYDROGEN_EXPORT_POE10_OPSO_MODELLING.parquet

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/isp_trace_parser/demand_traces.py	97.50% <100.00%> (-0.42%)	⬇️

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[nick-gorman]

Looks good Dylan!