Display official question's badge when it's in regular dashboard (#17167)

* Add icon prop to LegendItem

* Add icon prop to LegendHeader components

* Add headerIcon prop to Visualization

* Add headerIcon prop to DashCard

* Display official badge on questions in regular dashboards

* Add headerIcon prop to Funnel

* Add headerIcon prop to LineAreaBarChart

* Extract hasLegendHeader variable

* Pass headerIcon to visualisations with custom header

* Add E2E tests

* Add Icon prop-types

* Use imported Icon prop-types

* Fix post-rebase issue