Convert Shopper Checkout Purchase spec to Playwright

[ismaeldcom]

Fixes #10065

Changes proposed in this Pull Request

Convert the shopper-checkout-purchase spec from Puppeteer to Playwright.

This PR includes a copy of expectFraudPreventionToken already implemented in a previous PR.

Testing instructions

• Checkout dev/10177-convert-shopper-checkout-purchase-spec
• Run npm run test:e2e-pw shopper-checkout-purchase
• Test should pass locally.
• Test should pass in GH actions.

---

• Run npm run changelog to add a changelog file, choose patch to leave it empty if the change is not significant. You can add multiple changelog files in one PR by running this command a few times.
• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

Post merge

• Link to testing instructions from release testing doc following these instructions : QA Testing Not Applicable
• Add or update critical flows and testing instructions for critical flows, if applicable.
• Add what's changed (description, screenshot, demo videos etc.) to the release announcement post, if applicable.

[tpaksu]

Code is understandable and clean, tests well both on local and remote, LGTM. !

[tpaksu]

@ismaeldcom I think this will close 10065, not 10177 btw. Correct?

[ismaeldcom]

True! nice catch, I messed it up while copying the other PR ID for the existing code reference 😅