2.6.0-beta.2

Release of version 2.6.0-beta-2.
Testing plan: https://github.com/woocommerce/woocommerce-gutenberg-products-block/tree/master/docs/testing/cart-checkout

Changelog:

Note: this release will break compatibility with previously created Cart and Checkout blocks, this is expected behavior, you should remove and insert those blocks again.

• Paypal core payment method is supported.
• Order note has been removed until fully supported.
• Table validation on install to better support reserve_stock option.
• Fix an issue with invalid coupons breaking the cart.
• Fix an issue with shipping rates not updating.

And many style tweaks and fixes.