fix: Use full page navigation for OIDC logout instead of AJAX fetch (#7083)

[GowthamShanmugam]

The dashboard used fetch('/oauth2/sign_out') (AJAX) to trigger logout. When kube-auth-proxy responds with a 302 redirect to the IdP's end_session_endpoint (e.g. Microsoft Entra ID), the browser blocks the cross-origin redirect due to CORS policy. This prevents the IdP session from being terminated, causing immediate re-authentication.

Replace fetch() with window.location.href to perform a full page navigation, allowing the browser to follow the 302 redirect chain to the IdP logout page and back.

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