This restores the Infrastructure and Logs UIs after upstream changes:
* The theme json import now behaves like a ES6 module.
* The `<EuiHeaderSection>` now requires the `grow` prop to be `true` in order to grow horizontally.
* update eui to 4.5.1
* icons declared for logging / infra
* remove eui types that are now in EUI directly
* clean up duplicated EUI typescript definitions
* Fix EuiSelect usage in beats enrollment
