Fix: Ensure product bundle child variant selections are respected @W-15110504@

[joeluong-sfcc]

Description

This PR uses the updateItemsInBasket endpoint to update the variant selections in for product bundle children.

As of July 1st, 2024, the changes are deployed here and can be manually tested: https://scaffold-pwa-test-env-3.mobify-storefront.com/global/en-GB/product/test-bundle

Types of Changes

• [ ] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Documentation update
• [ ] Breaking change (could cause existing functionality to not work as expected)
• [ ] Other changes (non-breaking changes that does not fit any of the above)

Breaking changes include:

• Removing a public function or component or prop
• Adding a required argument to a function
• Changing the data type of a function parameter or return value
• Adding a new peer dependency to package.json

Changes

• (change1)

How to Test-Drive This PR

If you'd like to test against an instance with a bundle with children products that have variant selections instead of the default turquoise jewelry bundle, DM for details for updating your default.js

1. git checkout ju/update_child_variant
2. start the template-retail-react-app
3. look for a product bundle
4. add product bundle to cart selecting variants
5. navigate to cart page and observe that variant selections are reflected in the line item
6. edit the product bundle by using the product modal
7. observe that the changes are reflected in the cart

Checklists

General

• [ ] Changes are covered by test cases
• [ ] CHANGELOG.md updated with a short description of changes (not required for documentation updates)

Accessibility Compliance

You must check off all items in one of the follow two lists:

• [ ] There are no changes to UI

or...

• [ ] Changes were tested with a Screen Reader (iOS VoiceOver or Android Talkback) and had no issues
• [ ] Changes comply with WCAG 2.0 guidelines levels A and AA
• [ ] Changes to common UI patterns and interactions comply with WAI-ARIA best practices

Localization

• [ ] Changes include a UI text update in the Retail React App (which requires translation)

[vcua-mobify]

Left some comments in a slack thread. I think I am following the right steps for testing this change?

Could you please add some test steps here @joeluong-sfcc ?