feat: add user logout card

[hperl]

This adds a user logout card that will be used for logging out users in the OIDC front channel logout flow, as specified in the docs.

Fixes https://github.com/ory-corp/cloud/issues/4173 Part of https://github.com/ory-corp/cloud/issues/4155

Related Issue or Design Document

Checklist

• [x] I have read the contributing guidelines and signed the CLA.
• [x] I have referenced an issue containing the design document if my change introduces a new feature.
• [x] I have read the security policy.
• [x] I confirm that this pull request does not address a security vulnerability. If this pull request addresses a security vulnerability, I confirm that I got green light (please contact security@ory.sh) from the maintainers to push the changes.
• [x] I have added tests that prove my fix is effective or that my feature works.
• [x] I have added necessary documentation within the code base (if appropriate).

Further comments

[Benehiko]

As discussed, since this isn't part of the Kratos flows and is a custom implementation inside the Account Experience, we don't need to over-complicate the testing setup here. Also customization isn't currently necessary since it is only used inside Account Experience.