Convert the Order Full Refund spec to Playwright

[ismaeldcom]

Fixes #9961

Changes proposed in this Pull Request

• Convert merchant-orders-full-refund-spec from Puppeteer to Playwright.
• Screenshot code has been commented as all the screenshots code in Playwright, using the same TODO.

Testing instructions

• Checkout dev/9961-convert-merchant-orders-full-refund-spec
• Run npm run test:e2e-pw merchant-orders-full-refund-spec
• 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.

[eduardoumpierre]

The tests are passing, but I encountered a scenario where the first step of deactivating multi-currency could lead to flaky tests.

[eduardoumpierre]

Do you think it would be a good idea to check if multi-currency is enabled before proceeding? I’m mentioning this because the test fails when multi-currency is already disabled.

Alternatively, we could skip this step if the save button is disabled. I believe the Playwright version of those helpers behaves a bit differently and doesn’t include that extra check for the save button.

[ismaeldcom]

Thanks for noticing it, I initially missed the issue while dealing with the support phone thing. I think it's better to check if it's active instead of skipping the save button when it's disabled to avoid missing any 0981fae