[DURACOM-496] fix redirect for item page resolver

[FrankGameDev]

Porting of [CST-24936]

References

• https://4science.atlassian.net/browse/DURACOM-496
• If I open a related item in another tab I am logged out and redirected to the homepage #5853

Description

Fixes the issue #5853

List of changes in this PR:

1. Fixed redirect URL capture in authorized.operators.ts: Changed the redirectOn4xx operator to use router.getCurrentNavigation()?.extractedUrl?.toString() instead of router.url when capturing the redirect URL for unauthenticated users hitting 401/403 errors. This ensures the actual destination URL is captured during resolvers, rather than the stale previous URL.
2. Added getCurrentNavigation to router spy in tests: Updated the test spy in operators.spec.ts to include the getCurrentNavigation method so existing tests continue to pass.

How to test it

1. Log in as administrator
2. Navigate to a restricted item
3. Copy the item URL and open it in a new browser tab
4. Expected (after fix): User is redirected to login page, and after login, redirected back to the restricted item