Move SearchResultPager from @backstage/plugin-search to @backstage/plugin-search-react and deprecate it in @backstage/plugin-search

Signed-off-by: Anders Näsman <andersn@spotify.com>

plugins/search/api-report.md

@@ -237,7 +237,7 @@ export const SearchResult: ({
 
 // Warning: (ae-missing-release-tag) "SearchResultPager" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
 //
-// @public (undocumented)
+// @public @deprecated (undocumented)
 export const SearchResultPager: () => JSX.Element;
 
 // Warning: (ae-missing-release-tag) "SearchType" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)

plugins/search/src/components/SearchResultPager/SearchResultPager.tsx

@@ -29,6 +29,9 @@ const useStyles = makeStyles(theme => ({
   },
 }));
 
+/**
+ * @deprecated Moved to `@backstage/plugin-search-react`.
+ */
 export const SearchResultPager = () => {
   const { fetchNextPage, fetchPreviousPage } = useSearch();
   const classes = useStyles();