Add react-router-dom-v5-compat (#159173)

## Summary

Prep work for bumping react-router to v6
Following https://github.com/remix-run/react-router/discussions/8753

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Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

packages/kbn-ui-shared-deps-npm/webpack.config.js

@@ -99,6 +99,7 @@ module.exports = (_, argv) => {
         'react-dom',
         'react-dom/server',
         'react-router-dom',
+        'react-router-dom-v5-compat',
         'react-router',
         'react',
         'rxjs',