Remove Cypress dependency from CSNX

[SiAdcock]

What

These tests are the only Cypress tests in CSNX. We should convert them to Playwright.

Why

• fixes compatibility issue concerning Jest and Cypress tests. Currently we're working around this with --skipLibCheck, but this is not good practice
• eventually we will move this code to DCR, which uses Playwright. We only need one E2E testing framework, and Playwright is better

Can we delete the tests?

T&C are keen to keep these tests. From @vlkerag:

I think it is worth keeping them. They are essentially running a local version of the canaries to check that things are still working on that particular PR