Migrate RPs to OIDC Conformant mode

[gdestuynder]

This means switching the mode in the advanced settings for all RPs.

• [ ] Add owner info in auth0: first last to the description of each RP in auth0
• [ ] Use Auth0 API to list all RP owners
• [ ] Communicate change to RPs owners
• [ ] Switch RPs (group by group? all of them + test automation?)
• [ ] Enable OIDC conformant by default for new RPs