Convert Shopper Subscriptions Purchase Sign Up Fee spec to Playwright

[ismaeldcom]

Fixes #10089

Changes proposed in this Pull Request

• Implement placeOrderWithOptions to simplify specs, allowing for placing orders with customs params like product ID and billing address.
• Add goToSubscriptions to merchant navigation.
• Implement Playwright shopper-subscriptions-purchase-sign-up-fee spec.
• Remove Puppeteer shopper-subscriptions-purchase-sign-up-fee spec.

Testing instructions

• Checkout dev/10089-convert-shopper-subscriptions-purchase-sign-up-fee-spec
• Run npm run test:e2e-pw shopper-subscriptions-purchase-sign-up-fee
• 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]

Tests worked well locally. Left one comment that needs attention, but not so important. 🚢 it! Thanks for working on this.