Fix e2e tests: Update default behavior to use a block-based cart and checkout

[iamdharmesh]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

Cart and Checkout Blocks is now the default experience with WooCommerce 8.3. current e2e tests have shortcode cart and checkout as a default. This PR updates the default behavior to block-based cart and checkout.

Steps to test the changes in this Pull Request:

Make sure E2E tests run successfully locally and in GH action.

Changelog entry

Dev - Update default behavior to use a block-based cart and checkout in E2E tests.

[iamdharmesh]

@ravinderk Tests are failing in GH action while it is passing in local env. I tried 2-3 times and it pass every time. As you have worked on this, do you have any idea of the known issue of this failure?

[ravinderk]

@ravinderk Tests are failing in GH action while it is passing in local env. I tried 2-3 times and it pass every time. As you have worked on this, do you have any idea of the known issue of this failure?

@iamdharmesh I fixed the broken test. I also added a fix for the flaky test which we discussed.

[ravinderk]

Looking good