This reverts commit 4d88eabb500748df1f8c205c73ac55f3eb2d4fd8, reversing changes made to b38d3552026c60c3877b181d858359f5264545a4.
"state" means something specific to OAuth2 and SAML so we don't want to confuse developers who are working on this. Also don't use "session" which could easily be confused with HTTP cookies.