chore: Replace packages with native functions (#5140)

app/javascript/dashboard/helper/specs/flag.spec.js

@@ -0,0 +1,9 @@
+import { getCountryFlag } from '../flag';
+
+describe('#flag', () => {
+  it('returns the correct flag ', () => {
+    expect(getCountryFlag('cz')).toBe('🇨🇿');
+    expect(getCountryFlag('IN')).toBe('🇮🇳');
+    expect(getCountryFlag('US')).toBe('🇺🇸');
+  });
+});