* add translation keys for empty dashboard redesign
* run yarn i18n:extract; rephrase one trans key because of [warning] Found translation key already mapped to a map or parent of new key already mapped to a string: dashboard.toolbar.add.visualization
* reduce to 3-step locale phrase IDs
* extract phrase IDs
* Empty Dashboard state has its own CTA items and its own separate box to choose a library panel to create
* show empty dashboard screen if no panels
* add feature flag for empty dashboard redesign
* only show empty dashboard redesign if FF
* add-new-panel button is a dropdown with options: visualization, row, import, paste
* fix onPasteCopiedPanel types
* do not create new panel to new dashboard if emptyDashboardPage FF true
* ToolbarButton does not allow rendering of Dropdown's overlay - switch to Button
* remove panel-add icon's default size of xl
* separate components for add new panel from dash navigation bar
* Empty Dashboard state has its own CTA items and its own separate box to choose a library panel to create
* show empty dashboard screen if no panels
* start page for empty dashboard
* add feature flag for empty dashboard redesign
* only show empty dashboard redesign if FF
