[Stretch] Use the `ConfigurableComponent` in the Design System's Cookie Banner

[romaricpascal]

What

Use a preview branch of govuk-frontend to spike an update of the CookieBanner component to use the ConfigurableComponent class added by alphagov/govuk-frontend#5468 for receiving its cookieCategory and verify it works as we intend.

Why

So we can check the feature works as we intended it to and assess any unforeseen impact

Who needs to work on this

Developers

Who needs to review this

Developers

Done when

• [ ] We've updated CookieBanner to use the new ConfigurableComponent class.

[romaricpascal]

Closing as this will be deals with in #4275 now we've decided to go straight for implementing a class.