Allow font selection in embedded widgets (#22809)

...rise/frontend/src/metabase-enterprise/whitelabel/index.js

frontend/src/metabase/app.js

frontend/src/metabase/lib/embed.js

frontend/src/metabase/plugins/index.ts

...tabase/public/components/widgets/AdvancedSettingsPane.jsx

...end/src/metabase/public/components/widgets/CodeSample.jsx

...metabase/public/components/widgets/DisplayOptionsPane.jsx

...e/public/components/widgets/DisplayOptionsPane.styled.jsx

.../src/metabase/public/components/widgets/EmbedCodePane.jsx

.../metabase/public/components/widgets/EmbedModalContent.jsx

...nd/src/metabase/public/components/widgets/EmbedSelect.jsx

frontend/src/metabase/redux/embed.js

frontend/src/metabase/styled-components/theme/global.ts

frontend/src/metabase/styled-components/theme/global.tsx

...abase/scenarios/embedding/embedding-smoketests.cy.spec.js

...etabase/scenarios/embedding/embedding-snippets.cy.spec.js

...d/test/metabase/scenarios/embedding/embedding-snippets.js