LibraryPanels: Improves the Get All experience (#32028) (#32093)

* LibraryPanels: Improves Get All Api

* Refactor: using useReducer instead of useState

* Refactor: adds Pagination to UI

* Tests: adds reducer tests

* Refactor: using Observable instead to avoid flickering

* Refactor: moves exclusion to backend instead

* Chore: changing back the perPage default value

(cherry picked from commit f508a16a43)

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

packages/grafana-ui/src/components/Pagination/Pagination.tsx

@@ -13,9 +13,11 @@ interface Props {
   numberOfPages: number;
   /** Callback function for fetching the selected page  */
   onNavigate: (toPage: number) => void;
+  /** When set to true and the pagination result is only one page it will not render the pagination at all */
+  hideWhenSinglePage?: boolean;
 }
 
-export const Pagination: React.FC<Props> = ({ currentPage, numberOfPages, onNavigate }) => {
+export const Pagination: React.FC<Props> = ({ currentPage, numberOfPages, onNavigate, hideWhenSinglePage }) => {
   const styles = getStyles();
   const pages = [...new Array(numberOfPages).keys()];
 
@@ -71,6 +73,10 @@ export const Pagination: React.FC<Props> = ({ currentPage, numberOfPages, onNavi
     return pagesToRender;
   }, []);
 
+  if (hideWhenSinglePage && numberOfPages <= 1) {
+    return null;
+  }
+
   return (
     <div className={styles.container}>
       <ol>