Enable and update baseline for "icon-text-fit/textFit-grid-long" (#2983)

metrics/ignores/platform-all.json

@@ -85,7 +85,6 @@
     "render-tests/fill-pattern/update-feature-state": "https://github.com/mapbox/mapbox-gl-native/issues/15895",
     "render-tests/geojson/inline-linestring-fill": "current behavior is arbitrary",
     "render-tests/icon-text-fit/text-variable-anchor-overlap": "https://github.com/mapbox/mapbox-gl-native/issues/15809",
-    "render-tests/icon-text-fit/textFit-grid-long": "Needs to be investigated and fixed.",
     "render-tests/mixed-zoom/z10-z11": "https://github.com/mapbox/mapbox-gl-native/issues/10397",
     "render-tests/raster-masking/overlapping-zoom": "https://github.com/mapbox/mapbox-gl-native/issues/10195",
     "render-tests/real-world/bangkok": "https://github.com/mapbox/mapbox-gl-native/issues/10412",