preserve client_id and ticket query params across SRAM login

[michielbdejong]

If you're not logged in when doing a ticket flow, then when you come back from SRAM, the client_id and ticket are gone from the query of the URL. We should store them in state param or in cookie or something, and restore them from there afterwards.

[michielbdejong]

hm, openid-client complains that: checks.state argument is missing

[michielbdejong]

Ah right https://stackoverflow.com/a/78420267/680454 openid-client assumes I'm using state to check, not to store info. so maybe I'll just use cookies then