Prepare 7.4.0

[julien-nc]

Added

• React to a user session being revoked, end the IdP session @julien-nc #1181

Changed

• Only check oidc login token if logged in via user_oidc @julien-nc #1162

Fixed

• fix(backchannel-logout): handle those logout token cases: sid, sid+sub, sub. If only sub is set: kill all sessions for this sub @julien-nc #1184
• fix(bearer-validation): fix mistake in soft auto provisioning logic, same as Fix soft auto provisioning #1170 @julien-nc #1192
• fix(backend-registration): use OC_User::useBackend before 32 @julien-nc #1193