Enable opportunity card deletion (#490)

* Add checkbox

* Add state management for selected opportunities

* Use recoil for selected items state, show action bar

* Deduplicate code

* Add delete action

* Enable delete

* Add color for selected cards

* update board state on delete

* Add stories

* Enable empty board

* Fix story

* Handle dark mdoe

* Nits

* Rename module

* Better naming

* Fix naming confusion process<>progress

front/src/modules/pipeline-progress/states/boardColumnsState.ts

@@ -0,0 +1,8 @@
+import { atom } from 'recoil';
+
+import { Column } from '@/ui/components/board/Board';
+
+export const boardColumnsState = atom<Column[]>({
+  key: 'boardColumnsState',
+  default: [],
+});