Remove dependency on App Bridge React and update navigation patterns and components

[devisscher]

What problem is this PR solving?

Fixes: #196

Breaking change - major version release

This PR removes dependency on App Bridge React. In App Bridge React V4+ the utilities for navigation and opening modals are no longer needed. The preferred way is to leverage App Bridge React methods within you app.

Consequences of this change:

• HelpText was removed
• AppBridgeLink was removed
• The combination card was simplified to avoid opening the DiscountCombinationModal in web, which is not possible anymore
  • If a developer wants to show the possible combining discounts, they will need to create a modal within their app instead of spawning the DiscountCombinationModal in web, from their app.

Reviewers’ hat-rack 🎩

To tophat this change you'll need to do the following:

Testing in app context:

On your local machine:

1. shopify app init --template https://github.com/Shopify/function-examples/sample-apps/discounts\#update-discounts-app --package-manager yarn
2. Clone the discount-app-components repository onto your local machine in a different folder.
3. Run yalc publish --private
4. In the folder for the app you created in step 1 run: yalc add @shopify/discount-app-components
5. Then run yarn to install dependencies
6. Then run yarn dev to test your app out on your store
7. Ensure the volume discount page is properly rendered.

Testing storybook

1. Clone this repo
2. Run yarn && yarn storybook
3. Check that all components render properly in Storybook

Before requesting reviews

Before you deploy

Warning
With every PR, you MUST think through each of the items in the following checklist and check the appropriate ones. This step cannot be overlooked by the PR author or its reviewers. Please remove this warning when you're done.

• This PR is safe to rollback.
• I tophatted this change on Storybook.

[devisscher]

This is part of: https://github.com/Shopify/core-issues/issues/68945

[mathiusj]

have 🎩'd and reviewed code changes which LGTM, just left a comment to track the removal of the yalc.lock file 🙏

[mathiusj]

will just need to remove this file before shipping

[thosakwe]

Thanks for making this change! It will unblock migration to App Bridge v4 for many discount apps.