feat: add new transparent variants to sd-brandshape and update templates

[karlbaumhauer]

Description

There are new variants in the sd-brandshape and need to be added in code.

Tasks

• Create new transparent variants on the sd-brandshape according to Figma.
  https://www.figma.com/design/YDktJcseQIIQbsuCpoKS4V/Solid-DS-%E2%80%93-Component-Docs?node-id=13444-7804&t=KAA4MsUJmoqaItqU-0

• Update brandshape templates according to Figma
  https://www.figma.com/design/YDktJcseQIIQbsuCpoKS4V/Solid-DS-%E2%80%93-Component-Docs?node-id=2169-2026&t=u4nGRDa8Gh6ZeZGg-0

• Extend the brandshape template to include the new template with vertical copyright (needs to be in the templates in code, but stays on the docs in Figma)
  https://www.figma.com/design/YDktJcseQIIQbsuCpoKS4V/Solid-DS-%E2%80%93-Component-Docs?node-id=13444-7804&t=IaN6HHPIeQk62ABc-0

Where to put the documentation

Storybook

DoR

• Item has business value
• Item has been estimated by the team
• Item is clear and well-defined
• Item dependencies have been identified

DoD

• Documentation has been created/updated (if applicable)
• Migration Guide has been created/updated (if applicable)
• Relevant stories (Features, A11y) are created/updated
• Implementation works successfully on feature branch