[Export] Suppress duplicate texture format errors in UI and add missing in console mode.

platform/web/export/export_plugin.cpp

@@ -470,6 +470,9 @@ bool EditorExportPlatformWeb::has_valid_project_configuration(const Ref<EditorEx
 
 	if (p_preset->get("vram_texture_compression/for_mobile")) {
 		if (!ResourceImporterTextureSettings::should_import_etc2_astc()) {
+			if (EditorNode::is_cmdline_mode()) {
+				err += TTR("ETC2/ASTC texture compression is required for Web export. In the Project Settings, search for 'ETC2' in the search field, or enable 'Advanced Settings', and go to Rendering > Textures > VRAM Compression to enable 'Import ETC2 ASTC'.") + "\n";
+			}
 			valid = false;
 		}
 	}