openego / eDisGo / 35713700688

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fix(run): carry opf_results onto the full grid in spatial_restore (#761)

spatial_reduce stashes a deepcopy of the full grid before the OPF runs and
spatial_restore returns that stash, but map_reduced_results_to_full_grid
transfers only the flexible-component dispatch time series. The object the
pipeline continued with therefore still held the pristine, empty OPFResults
constructed before the solve, so save with save_opf_results: true wrote an
opf_results/ directory containing no CSV files at all.

This affected every run with spatial_reduction.enabled: true regardless of
opf_version, and made the overlying-grid conservation checks impossible to
perform on a saved object, since all of them read opf_results.

The results are attached verbatim rather than disaggregated.
hv_requirement_slacks_t and overlying_grid are indexed by flexibility
category and battery_storage_t by storage-unit name (storage units are never
aggregated), so these carry over unambiguously and cover the conservation
checks. lines_t, slack_generator_t, heat_storage_t and grid_slacks_t keep
reduced-grid component names that do not match the full grid's topology under
aggregation_mode: true; they are kept rather than dropped, with the caveat
documented on the task.

Fixes #760
Refs openego/eGo#212

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9513 of 11344 relevant lines covered (83.86%)

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