Turn off React strict mode in SharedUX Storybook (#215926)

## Summary

This PR removes React strict mode from Storybook stories owned by
SharedUX team. This is needed because both `EuiTooltip` and
`EuiAccordion` are currently not compatible with strict mode and they
won't function properly in stories.

As requested in
https://github.com/elastic/kibana/pull/214854#discussion_r2012415842 I
opened a separate PR to address this problem.

src/platform/packages/private/shared-ux/storybook/config/main.ts

@@ -15,7 +15,4 @@ module.exports = {
     '../../**/*.stories.+(tsx|mdx)',
     '../../../../shared/shared-ux/**/*.stories.+(tsx|mdx)',
   ],
-  reactOptions: {
-    strictMode: true,
-  },
 };