Cookie redirects do not work on mobile and desktop

[Bopchy]

Describe the bug
Cookie redirects do not work on mobile devices and desktop browsers. This is likely because cookies that are not getting set on desktop and on mobile.

To Reproduce
Steps to reproduce the behaviour:

1. Go to http://localhost:7080/serbian on a mobile device/desktop browser. The page should navigate to http://localhost:7080/serbian/lat
2. Click on the script link in the top right hand corner of the banner. This should cause the page to navigate to http://localhost:7080/serbian/cyr
3. Click on the Brand svg
4. See error (the page should load http://localhost:7080/serbian/cyr and not http://localhost:7080/serbian/lat)

Expected behavior
On Desktop browsers/mobile devices, clicking on the brand svg after clicking on the script link should load chosen variant page, not default.

Screenshots

Testing notes

• This bug fix is expected to need manual testing.

Additional context
This issue is only on mobile devices. Desktop works as expected.

[Bopchy]

Needs #4948 and #4833 to be merged

[tochwill]

#4948 is merged into the feature branch now - I think we should look at this before we merge the feature branch to latest?

[tochwill]

Is this the same as Service variant not respected on initial render #4976 - or does the page not re-render at all? I've tried this locally and I see the behaviour described in that bug ticket.

[Bopchy]

On mobile, the page does not re-render

[Bopchy]

This issue is being caused by client-side javascript not loading when the hostname is not localhost on test devices. Because the redirect is happening on the client as mentioned here, if the client's javascript does not load, then the redirect will not work

[Bopchy]

Closing this as this is not really a bug, but an issue caused with how testing gets done.