Remove non-functional dashboard filter options for consistency

- Remove 'My dashboards' and 'Shared with me' filters from DashboardHeader.tsx
- Keep 'All' filter option matching collections page pattern
- Addresses GitHub comment about dashboard consistency
- Both collections and dashboards now have consistent filtering behavior

Co-Authored-By: Wells Bunker <wells@buster.so>

apps/web/src/controllers/DashboardListController/DashboardHeader.tsx

@@ -46,18 +46,6 @@ const filters: SegmentedItem<string>[] = [
     label: 'All ',
     value: JSON.stringify({}),
   },
-  {
-    label: 'My dashboards',
-    value: JSON.stringify({
-      only_my_dashboards: true,
-    }),
-  },
-  {
-    label: 'Shared with me',
-    value: JSON.stringify({
-      shared_with_me: true,
-    }),
-  },
 ];
 
 const DashboardFilters: React.FC<{