Add markdown support to EditableText (#29890)

e2e/test/scenarios/collections/collections.cy.spec.js

e2e/test/scenarios/dashboard/dashboard.cy.spec.js

e2e/test/scenarios/models/models.cy.spec.js

...end/src/metabase/collections/components/BaseTableItem.jsx

...ections/components/CollectionHeader/CollectionCaption.tsx

...omponents/CollectionHeader/CollectionHeader.unit.spec.tsx

...ase/core/components/EditableText/EditableText.stories.tsx

...base/core/components/EditableText/EditableText.styled.tsx

...rc/metabase/core/components/EditableText/EditableText.tsx

...e/core/components/EditableText/EditableText.unit.spec.tsx

...src/metabase/core/components/Markdown/Markdown.styled.tsx

frontend/src/metabase/core/components/Markdown/Markdown.tsx

...rc/metabase/dashboard/components/DashboardInfoSidebar.tsx

..._builder/components/view/sidebars/QuestionInfoSidebar.tsx

...components/view/sidebars/QuestionInfoSidebar.unit.spec.js

...base/visualizations/components/ChartCaption.unit.spec.tsx

...ase/visualizations/components/ScalarValue/ScalarValue.jsx

...tabase/visualizations/components/legend/LegendCaption.jsx

...etabase/visualizations/visualizations/Scalar.unit.spec.js