SSO: trigger invalidation after user logout via LinkAce

[Kovah]

Discussed in #903

^{Originally posted by caplam February 11, 2025}
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I have one problem yet : when logging out linkace the browser stays on linkace logging page instead of launching invalidation flow in authentik.

I used this post to debug my setup while writing it. I hope it will be useful to someone trying to setup authentik for linkace.

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Authentik example: https://docs.goauthentik.io/docs/add-secure-apps/flows-stages/flow/examples/default_flows