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fix(csv-exporter): exclude GRID_LEVEL_COL column - 21.2.x (#17913)

* fix(csv-exporter): exclude GRID_LEVEL_COL column - 21.2.x

Exporting a grid with summaries to CSV added the internal
GRID_LEVEL_COL helper column used for Excel summary formulas.
Filter it out of the exported columns, as the Excel and PDF
exporters do.

Backport of #17912. Closes #17908

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fix(csv-exporter): exclude GRID_LEVEL_COL for hierarchical grids

Hierarchical grids keep their columns under the grid instance, so
the CSV exporter takes the keys from the records, which still hold
the internal GRID_LEVEL_COL. Leave it out of those keys as well,
keeping the child grid fields.

Backport of 99ab746a86 from #17912.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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