Dashboard logout should trigger OAuth logout endpoint

Lukarequested to merge
feat/trigger-oauth-logout into main

@maarten So this is an initial idea... please check it out and try it.

So there is a problem with this logic if we will serve the apps for clients on subdomain like we currently are serving dashboard.init.stackspin.net.

Logout url for INIT is https://sso.init.stackspin.net/oauth2/sessions/logout -> I cannot take out dashboard part out, since I dont know if it will be dashboard for all the clients.

Please take a look and we discuss.

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