providers/oauth2: remember session_id from initial token (#7976) * providers/oauth2: remember session_id original token was created with for future access/refresh tokens * providers/proxy: use hashed session as `sid` --------- Signed-off-by: Jens Langhammer <jens@goauthentik.io> Co-authored-by: Jens L <jens@goauthentik.io>