chore: Update JSON importer to use zip streaming (#12380)

* chore: Update JSON importer to use zip streaming, new importer flow

* chore: Drop teamId from import urlId collision check and remove unused internal-id scaffolding

urlId is globally unique on Document/Collection so the team scope was wrong.
Also removes leftover internal-id generation in JSONAPIImportTask that was
never used in task input/output.

* Restore classes used upstream

app/scenes/Settings/components/DropToImport.tsx

@@ -67,6 +67,14 @@ function DropToImport({ disabled, onSubmit, children, format }: Props) {
             permission: permission ?? undefined,
           }
         );
+      } else if (format === FileOperationFormat.JSON) {
+        await imports.create(
+          { service: IntegrationService.JSON },
+          {
+            attachmentId: attachment.id,
+            permission: permission ?? undefined,
+          }
+        );
       } else {
         await collections.import(attachment.id, { format, permission });
       }