* delete PanelHeader
* PanelHeaderMenuItem is only used in PageHeader
* PanelHeaderCorner only used by PanelEditorTableView
* PanelHeaderMenuTrigger not used anywhere
* PanelHeaderMenuWrapperNew is PanelHeaderMenuWrapper, old one is deleted
* remove newPanelChromeUI from test
* delete feature flag newPanelChromeUI
* PanelHeaderMenuWrapperNew is PanelHeaderMenuWrapper, old one is deleted
* setup menu as a render prop sent down from PanelStateWrapper to PanelChrome
* let the Dropdown take care of opening the menu in PanelChrome
* menu and leftItems are on the right side of the header together
* add storybook examples with menu
* menu does not need to be a callback because it's opened in a Dropdown anyway
* pass down to getPanelMenu whether or not data is streaming atm
* stop loading data as well as streaming from menu
* override menu's style where needed
* reduce snapshot matching in tests