fix(auth): force reload to / on any logout result

[andrewazores]

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See https://github.com/cryostatio/cryostat-helm/pull/131#issuecomment-2052411429

Description of the change:

Force reload to application root path on any signout response, success or failure or error.

How to manually test:

1. See https://github.com/cryostatio/cryostat-helm/pull/131#issuecomment-2052411429 for the k8s/OpenShift case, or use cryostat3 smoketest for a simple oauth2 proxy case
2. Build an image including this PR, or use the image quay.io/andrewazores/cryostat:3.0.0-logout-refresh-1
3. Test logging in and then logging out. In all cases (OAuth2 proxy with htpasswd Basic, openshift-oauth-proxy with only OpenShift SSO, or openshift-oauth-proxy with OpenShift SSO + htpasswd Basic), logging out from the UI should kick the browser back out to the auth proxy sign in page. Refreshing from here or reopening the URL in a new tab/window should still result in the sign in page (session has been cleared). Logging back in again should work as expected.