fix(catalog-react): fix relation cards showing only one entity

Use `paginationOptions: { type: 'none' }` in EntityDataTable instead
of deriving page size from data length, which was 0 during the initial
loading render causing only one row to be displayed.

Signed-off-by: Johan Persson <johanopersson@gmail.com>

.changeset/smart-cycles-fall.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-react': patch
+---
+
+Fixed entity relation cards (e.g., "Has components") only showing one entity at a time by using `paginationOptions: { type: 'none' }` instead of deriving page size from data length.

plugins/catalog-react/src/components/EntityDataTable/EntityDataTable.test.tsx

@@ -132,6 +132,24 @@ describe('<EntityDataTable />', () => {
     expect(rows()[1]).toHaveTextContent('alpha');
   });
 
+  it('shows all rows after loading completes', async () => {
+    const { rerender } = await renderInTestApp(
+      <EntityDataTable columnConfig={columns} data={[]} loading />,
+      {
+        mountedRoutes: {
+          '/catalog/:namespace/:kind/:name': entityRouteRef,
+        },
+      },
+    );
+
+    rerender(<EntityDataTable columnConfig={columns} data={entities} />);
+
+    const rows = screen.getAllByRole('row').slice(1);
+    expect(rows).toHaveLength(2);
+    expect(rows[0]).toHaveTextContent('bravo');
+    expect(rows[1]).toHaveTextContent('alpha');
+  });
+
   it('does not sort when column has no sortValue', async () => {
     const unsortableColumns: EntityColumnConfig[] = [
       {

plugins/catalog-react/src/components/EntityDataTable/EntityDataTable.tsx

@@ -61,7 +61,7 @@ export function EntityDataTable(props: EntityDataTableProps) {
     mode: 'complete',
     data: tableData,
     sortFn,
-    paginationOptions: { pageSize: tableData.length || 1 },
+    paginationOptions: { type: 'none' },
   });
 
   return (
@@ -71,7 +71,6 @@ export function EntityDataTable(props: EntityDataTableProps) {
       loading={loading}
       error={error}
       emptyState={emptyState}
-      pagination={{ type: 'none' }}
     />
   );
 }