New button variant for usage on images and internal components

[marcelbertram]

Scope

Following up the request for new sizing variants of the button/link we need also a new variant of handling the usage of smaller buttons on images or within internal components (e.g. modal X, slider) as the button/link needs a backgroud color but not outline.

Note

• Sizing issue: https://github.com/porsche-design-system/porsche-design-system/issues/3182

Acceptance Criteria

• Solution defined to cover additional use cases with less variant / implementation efforts