chore(lint): convert dashboard components to function components

Converts Dashboard, DashboardGrid, SliceAdder, DragDroppable,
FilterScopeModal, FilterScopeSelector, gridComponents (Chart, Divider,
Header, Markdown, DraggableNewComponent), menu components (HoverMenu,
BackgroundStyleDropdown, MarkdownModeDropdown, WithPopoverMenu),
nativeFilters (FilterValue, DefaultValue), PublishedStatus, and
UndoRedoKeyListeners from class to function components.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>