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panel-header: Move the panel description/links/error container outside of panel header to not interfere with the react-grid stuff

panel-header: Make it possible to style the reference element and fix so panel description looks good

panel-header: Updates for the new react-popper api and make it possible to hover the tooltip popper without it closing

panel-header: Bump @types/react, @types/react-dom, react, react-dom, react-popper to latest versions

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- get rid of drop shadow
- get rid of top border
- add min height for better no-data placement
- add margins

Datasource selection triggers a connection test, on success
the DS is set in the Explore state. If the test takes long and user
selects a different DS, and just after that the first test succeeds,
then the first DS overwrites the state.

* when test returns check if datasource is still the requested one

12759 React-panel: description and links

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