fix: preserve unknown JSON omission counts (#5905)

* fix: preserve unknown JSON omission counts

* fix: preserve unknown counts for unselected JSON

* fix: preserve unknown counts for uppercase JSON

src/application/javascript/JavaScriptArtifactGraphStructure.ts

@@ -612,7 +612,12 @@ const createFileTarget = (
             javascript?.parse_status ?? (skipped ? "skipped" : null),
           json_parse_status: json?.status ?? null,
           json_top_level_keys: json?.top_level_keys ?? [],
-          omitted_json_top_level_keys: json?.omitted_top_level_keys ?? 0,
+          omitted_json_top_level_keys:
+            json === undefined
+              ? file.kind === "json" || file.kind === "package-json"
+                ? null
+                : 0
+              : json.omitted_top_level_keys,
           vendor_markers: javascript?.vendors ?? [],
         },
         evidence: artifactObservationEvidence({