Merge pull request #13197 from backstage/mob/services

backend-system: add default service factories

.changeset/gorgeous-swans-kiss.md

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+---
+'@backstage/plugin-catalog-backend-module-github': patch
+---
+
+New experimental alpha exports for use with the upcoming backend system.

.changeset/old-tables-joke.md

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+---
+'@backstage/backend-plugin-api': patch
+---
+
+Simplified the `ServiceFactory` type and removed `AnyServiceFactory`.

.changeset/spicy-cherries-remember.md

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+---
+'@backstage/backend-app-api': patch
+'@backstage/backend-defaults': patch
+'@backstage/backend-test-utils': patch
+---
+
+Updated usages of `ServiceFactory`.

.changeset/strong-games-kiss.md

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+---
+'@backstage/plugin-catalog-backend': patch
+'@backstage/plugin-catalog-node': patch
+---
+
+The experimental `CatalogProcessingExtensionPoint` now accepts multiple providers and processors at once.

.changeset/tame-papayas-protect.md

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+---
+'@backstage/backend-plugin-api': patch
+---
+
+When defining a new `ServiceRef` you can now also include a `defaultFactory`, which will be used to construct instances of the service in case there is no explicit factory defined.