Update OIDC module to v2 and add install profiles as composer project

With this MR I took the changes I found in !4 (closed) in composer.json only and re-applied them on top of branch 8.9.14.

There was development in the install profile's in the /web/profiles/ dir, but it is impossible to track code changes in this repo, because it's totally not git-friendly. Instead, I composerized the install profile and required it with composer. I moved @fborgesa 's dev to a branch in the install profile's repo (the branch I fetch in composer.json for the cern-install-profiles pkg): https://gitlab.cern.ch/drupal/profiles/-/commits/k8s

Note: Keep simplesaml module for compatibility with migrated websites.