feat: use the new logout endpoint (v3-apps)

[framitdavid]

Description

Switches the "Logg ut"-link to the new Altinn 3 platform endpoint.

• Before: https://{altinnHost}/ui/authentication/LogOut
• After: https://platform.{altinnHost}/authentication/api/v1/logout

Changes

• src/utils/urls/urlHelper.ts — logoutUrlAltinn(url) now uses extractHostFromUrl to build the platform host. Local/unknown origins return / (was /ui/authentication/LogOut / nullui/authentication/LogOut).
• src/utils/urls/urlHelper.test.ts — Tightened assertions from .toContain to .toBe and added cases for local/unknown origins.

The single callsite (AltinnAppHeaderMenu.tsx) is untouched.

To be able to test this we do need to build locally and upload the build to CDN.

Related Issue(s)

• Closes the v3 part of following issue: https://github.com/Altinn/altinn-studio/issues/18676Closes the v4 part of following issue: Endring av endepunkt for logout i Altinn 3 altinn-studio#18676

Verification/QA

• Manual functionality testing
  • I have tested these changes manually
  • Creator of the original issue (or service owner) has been contacted for manual testing (or will be contacted when released in alpha)
  • No testing done/necessary
• Automated tests
  • Unit test(s) have been added/updated
  • Cypress E2E test(s) have been added/updated
  • No automatic tests are needed here (no functional changes/additions)
  • I want someone to help me make some tests
• UU/WCAG (follow these guidelines until we have our own)
  • I have tested with a screen reader/keyboard navigation/automated wcag validator
  • No testing done/necessary (no DOM/visual changes)
  • I want someone to help me perform accessibility testing
• User documentation @ altinn-studio-docs
  • Has been added/updated
  • No functionality has been changed/added, so no documentation is needed
  • I will do that later/have created an issue
• Support in Altinn Studio
  • Issue(s) created for support in Studio
  • This change/feature does not require any changes to Altinn Studio
• Sprint board
  • The original issue (or this PR itself) has been added to the Team Apps project and to the current sprint board
  • I don't have permissions to do that, please help me out
• Labels
  • I have added a kind/* and backport* label to this PR for proper release notes grouping
  • I don't have permissions to add labels, please help me out

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[Magnusrm]

LGTM, the changes in percy seems to come from a comparison towards main. The failing cypress tests seem to come from the app "anonymous-stateless-app-v3" being unpublished