Base64 Encoded fonts for storybook (#11347)

### WHY are these changes introduced?

Base64 encode our Inter font dependencies for storybook so we can be
sure that they're loaded immediately in chromatic 🤞

polaris-react/.storybook/preview.js

@@ -5,21 +5,8 @@ import enTranslations from '../locales/en.json';
 import {GridOverlay} from './GridOverlay';
 import {RenderPerformanceProfiler} from './RenderPerformanceProfiler';
 import {gridOptions, featureFlagOptions} from './manager';
-import isChromatic from 'chromatic/isChromatic';
 import {themeNameDefault, themeNames, themes} from '@shopify/polaris-tokens';
 
-// Use the document.fonts API to check if fonts have loaded
-// https://developer.mozilla.org/en-US/docs/Web/API/Document/fonts API to
-const fontLoader = async () => ({
-  fonts: await document.fonts.ready,
-});
-
-/* 👇 It's configured as a global loader
- * See https://storybook.js.org/docs/react/writing-stories/loaders
- * to learn more about loaders
- */
-export const loaders = isChromatic() && document.fonts ? [fontLoader] : [];
-
 function StrictModeDecorator(Story, context) {
   const {strictMode} = context.globals;
   const Wrapper = strictMode ? React.StrictMode : React.Fragment;