Add severity filter (#11190)

* Allow viewing all types on single screen

* Implement for mobile as well

* fix import

* Show all is optional

web/src/types/review.ts

@@ -26,6 +26,7 @@ export type ReviewFilter = {
   before?: number;
   after?: number;
   showReviewed?: 0 | 1;
+  showAll?: boolean;
 };
 
 type ReviewSummaryDay = {