refactor: Remove unused systemjs export

The "system" export was removed from the package.json file.
This simplifies the package configuration and removes a potentially confusing or unused export.

Author: jlongyam

package.json

@@ -28,8 +28,7 @@
     ".": {
       "import": "./src/Test.js",
       "require": "./dist/Test.cjs"
-    },
-    "./system": "./dist/Test.js"
+    }
   },
   "type": "module",
   "main": "./src/Test.js",