Filter 3rd party images in Delivery Dashboard

[ThormaehlenFred]

What would you like to be added:
Filter functionality based on (new) tag for images which are consumed as is from upstream open-source where the ownership is not in the hands of the team running the dashboard (here Gardener Team).

Why is this needed:
Sometimes there are support contracts required by orgs running the Delivery Dashboard with their 3rd party vendors which may list those upstream open-source images or the related open-source projects, to appear in those contracts.