feat: people infinite scroll (#11326)

* feat: people infinite scroll

* add infinite scroll to show & hide modal

* update unit tests

* show total people count instead of currently loaded

* update personsearchdto

web/src/lib/__mocks__/intersection-observer.mock.ts

@@ -0,0 +1,9 @@
+import { vi } from 'vitest';
+
+export const getIntersectionObserverMock = () =>
+  vi.fn(() => ({
+    disconnect: vi.fn(),
+    observe: vi.fn(),
+    takeRecords: vi.fn(),
+    unobserve: vi.fn(),
+  }));