[POC] Enforce style on express checkout buttons

[tarunvijwani]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

P2 Post: pdFofs-1O1-p2

This is POC PR to demonstrate limited control over the express checkout buttons using the wrapper component.

In this PR, we're enforcing the style on express checkout buttons. If there are two express checkout buttons, it will display them in a single column instead of the single row.

The branch is based on #44346 PR branch.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Activate the Stripe plugin and enable express payment options.
2. Activate the PayPal payment plugin and enable express payment options.
3. Add a product to the Cart and visit the Checkout block page with https.
4. Confirm the below express payment buttons is displayed in a single column:
   

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Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

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[github-actions]

Test Results Summary

Commit SHA: af39033

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 38s
E2E Tests	304	0	0	13	0	317	7m 20s

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To view the full API test report, click here.
To view the full E2E test report, click here.
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