Remove EuiPageSideProps from src/components/index.js export

[chandlerprall]

Summary

Removes an additional exported type identified in #4597 (comment). This one wasn't reported during a webpack build presumably because its source file does export * from compared to the explicit export { ComponentProps} pattern which exported the others. This is the last occurrence of props in src/components/index.js.

Looked into making CI fail if webpack issued the warning about an unknown import but decided against for a few reasons:

• looks like it requires adding a plugin e.g. https://www.npmjs.com/package/fail-on-errors-webpack-plugin
• we'd have to shoe-horn it into the CI environment for dist build or devserver+axe configurations, which is brittle
• final conversion of index.js->TypeScript will need to handle this in an entirely different way

So to me it isn't worth it, but I can be told otherwise :)

[cchaos]

🤦 Thanks!

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_4604/

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_4604/