Merge pull request #20586 from backstage/camilaibs/improve-error-boundary-component

[DI]  Improve `ExtensionBoundary` component

.changeset/fluffy-years-shake.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog': patch
+---
+
+Use default extensions boundary and suspense on the alpha declarative `createCatalogFilterExtension` extension factory.

.changeset/sixty-tips-argue.md

@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-plugin-api': patch
+---
+
+Improve the extension boundary component and create a default extension suspense component.

.changeset/young-days-talk.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-search-react': patch
+---
+
+Use default extensions boundary and suspense on the alpha declarative `createSearchResultListItem` extension factory.