fix: message props update without button teardown

There was a bug where updating button message properties such as amount would tear down then rebuild the entire button component to render the new message. This fix allows just the message to rerender and preserves the button.

Testing instructions:

Setup

open this paypal-js PR locally
execute npm run build in paypal-js
open paypal-js file explorer to packages/react-paypal-js/dist and copy the cjs and esm directories
open this lighthouse-ecommerce AKA "Palmart" PR locally
run npm install
open Palmart file explorer to node_modules/@paypal/react-paypal-js/dist
delete the cjs and esm directories
paste copied cjs and esm directories there
delete .next directory (previous node_module builds are cached there, and we do not want to use those)
execute npm run dev
- if it does not launch and gives node: --openssl-legacy-provider is not allowed in NODE_OPTIONS, you must first set the node version to the version specified in the .nvmrc file

Validation

go to a product page and change the item quantity. The button message quantity should update but not tear down the buttons.

paypal / paypal-js

fix: message props update without button teardown #536

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