Add availableForSale to variant

[powerwlsl]

Add to cart button should be disabled when there's no stock for each variant.

 <Button
aria-label="Add to Cart"
type="button"
className={s.button}
onClick={addToCart}
loading={loading}
disabled={variant?.availableForSale === false}
>
{variant?.availableForSale === false
? 'Not Available'
: 'Add To Cart'}
</Button>

[vercel]

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[vercel]

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Name	Status	Preview	Updated
commerce-bigcommerce	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-commerce	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-commercejs	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-kibocommerce	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-local	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-ordercloud	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-pbt01	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-saleor	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-sfcc	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-shopify	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-site	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-spree	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)
commerce-swell	✅ Ready (Inspect)	Visit Preview	Aug 16, 2022 at 5:53AM (UTC)
commerce-vendure	❌ Failed (Inspect)		Aug 16, 2022 at 5:53AM (UTC)

[manovotny]

We appreciate the time you took to make this PR. We have decided to take Next.js Commerce in a new direction, but I am happy to say that this feature will be present in the upcoming release. Please see this PR for more details: #966