OZG-5832 Add isLoading button story

alfa-client/libs/design-system/src/lib/button/button.stories.ts

@@ -36,7 +36,6 @@ export const Default: Story = {
 export const WithIcon: Story = {
   args: {
     text: 'I have an icon',
-    isLoading: false,
     variant: 'outline',
   },
   render: (args) => ({
@@ -46,3 +45,10 @@ export const WithIcon: Story = {
     </ods-button>`,
   }),
 };
+
+export const IsLoading: Story = {
+  args: {
+    text: 'Loading...',
+    isLoading: true,
+  },
+};