fix(geojson-layer): add null-safety checks to prevent crashes on malformed features (#2383)

[pierreeurope]

Summary

Adds defensive null checks in geojson-utils to prevent "Cannot read properties of undefined" crashes when processing GeoJSON data with null or malformed features.

Problem

When loading CSV data with a geojson column, certain rows may contain empty, null, or malformed geometry data. This causes crashes like:

Cannot read properties of undefined (reading 'type')

The dataToFeature array can contain null entries for rows where geometry parsing failed, but some code paths accessed properties without checking for null first.

Changes

src/layers/src/geojson-layer/geojson-utils.ts

1. applyFiltersToTableColumns: Added null check for feature, feature.geometry, and feature.geometry.coordinates before iterating coordinates. Previously, the code accessed feature.geometry.coordinates before checking if feature was truthy (the check was in the wrong order on the next line).

2. parseGeoJsonRawFeature: Added check for empty normalized.features array to prevent accessing features[0] on an empty array.

3. getGeojsonLayerMeta: Used optional chaining for center() result geometry access, since the turf center function could theoretically return unexpected results for degenerate geometries.

Closes #2383