catalog-react: enable entity cards and content by default in new system

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/witty-geese-battle.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-react': patch
+---
+
+Entity page extensions created for the new frontend system via the `/alpha` exports will now be enabled by default.

plugins/catalog-react/src/alpha.tsx

@@ -83,7 +83,7 @@ export function createEntityCardExtension<
       id: 'entity-content:catalog/overview',
       input: 'cards',
     },
-    disabled: options.disabled ?? true,
+    disabled: options.disabled,
     output: {
       element: coreExtensionData.reactElement,
       filterFunction: catalogExtensionData.entityFilterFunction.optional(),
@@ -137,7 +137,7 @@ export function createEntityContentExtension<
       id: 'page:catalog/entity',
       input: 'contents',
     },
-    disabled: options.disabled ?? true,
+    disabled: options.disabled,
     output: {
       element: coreExtensionData.reactElement,
       path: coreExtensionData.routePath,