Use browser default time and number formatting with polyfills if needed (#9481)

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

test/setup.js

@@ -0,0 +1,12 @@
+const fs = require("fs");
+const path = require("path");
+
+process.env.TZ = "Etc/UTC";
+process.env.IS_TEST = "true";
+
+const MDI_OUTPUT_DIR = path.resolve(__dirname, "../build/mdi");
+
+if (!fs.existsSync(MDI_OUTPUT_DIR)) {
+  fs.mkdirSync(MDI_OUTPUT_DIR, { recursive: true });
+  fs.writeFileSync(path.resolve(MDI_OUTPUT_DIR, "iconMetadata.json"), "{}");
+}