feat: Support for CXML self service configuration

[suschneider]

PR Type

[x] Feature

What Is the Current Behavior?

It is not possible to configure specific configurations for CXML Punchout users in the PWA.

What Is the New Behavior?

User specific configurations for CXML Punchout are possible in the MyAccount area of the PWA.

Does this PR Introduce a Breaking Change?

[x] No

Other Information

IAD: https://www.figma.com/design/DnogQvuEuB0fbqs7uG264R/CXML-self-service-configuration-in-MyAccount?node-id=0-1&t=yaKr7p89rS9FLcBm-0

AB#95963

AB#97411