docs(storybook): update theme and switch theme icon (#10593)

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/carbon-react/.storybook/preview.js

@@ -40,7 +40,7 @@ export const globalTypes = {
     description: 'Set the global theme for displaying components',
     defaultValue: 'white',
     toolbar: {
-      icon: 'circlehollow',
+      icon: 'paintbrush',
       items: ['white', 'g10', 'g90', 'g100'],
     },
   },

packages/carbon-react/.storybook/theme.js

@@ -6,52 +6,19 @@
  */
 
 import { create } from '@storybook/theming';
-import { g10 } from '@carbon/themes';
 import PackageInfo from './../package.json';
 
-const {
-  field01,
-  interactive01,
-  selectedUI,
-  text01,
-  inverse01,
-  ui01,
-  ui03,
-  uiBackground,
-} = g10;
-
+/**
+ * @see https://storybook.js.org/docs/react/configure/theming
+ */
 export default create({
   base: 'light',
 
-  colorPrimary: interactive01,
-  colorSecondary: selectedUI,
-
-  // UI
-  appBg: uiBackground,
-  appContentBg: ui01,
-  appBorderColor: ui03,
-  appBorderRadius: 0,
-
   // Typography
   fontBase: "'IBM Plex Sans', 'Helvetica Neue', Arial, sans-serif",
   fontCode:
     "'IBM Plex Mono', Menlo, 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', Courier, monospace",
 
-  // Text colors
-  textColor: text01,
-  textInverseColor: inverse01,
-
-  // Toolbar default and active colors
-  barTextColor: text01,
-  barSelectedColor: interactive01,
-  barBg: uiBackground,
-
-  // Form colors
-  inputBg: field01,
-  inputBorder: ui03,
-  inputTextColor: text01,
-  inputBorderRadius: 0,
-
   brandTitle: `@carbon/react@${PackageInfo.version}`,
   brandUrl:
     'https://github.com/carbon-design-system/carbon/tree/main/packages/carbon-react',