Prevent console warning spam by logging only once

Co-authored-by: Rugvip <4984472+Rugvip@users.noreply.github.com>

plugins/catalog/src/alpha/DefaultEntityContentLayout.tsx

@@ -32,6 +32,9 @@ import {
 } from '../components/EntityProcessingErrorsPanel';
 import { HorizontalScrollGrid } from '@backstage/core-components';
 
+// Module-level flag to ensure deprecation warning is only logged once
+let hasLoggedSummaryWarning = false;
+
 const useStyles = makeStyles<
   Theme,
   { infoCards: boolean; summaryCards: boolean; contentCards: boolean }
@@ -144,7 +147,8 @@ export function DefaultEntityContentLayout(props: EntityContentLayoutProps) {
     card => !card.type || card.type === 'content',
   );
 
-  if (summaryCards.length > 0) {
+  if (summaryCards.length > 0 && !hasLoggedSummaryWarning) {
+    hasLoggedSummaryWarning = true;
     // eslint-disable-next-line no-console
     console.warn(
       "The 'summary' entity card type has been removed. Please update your cards to use 'content' or 'info' types instead.",