Merge pull request #13347 from backstage/jhaals/catalogService

catalog-node: Export experimental catalogServiceRef

.changeset/chatty-cars-kick.md

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+---
+'@backstage/plugin-catalog-node': patch
+---
+
+Adds experimental `catalogServiceRef` for obtaining a `CatalogClient` in the new backend system.

.changeset/purple-jeans-bathe.md

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+---
+'@backstage/backend-app-api': patch
+---
+
+Updated `ServiceRegistry` to not initialize factories more than once.

.changeset/stupid-pigs-appear.md

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+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Added alpha `scaffolderPlugin` to be used with experimental backend system.