Merge pull request #15589 from backstage/rugvip/httpmove

backand-app-api: move over HTTP server implementation from backend-common

.changeset/fair-seals-fry.md

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+---
+'@backstage/backend-app-api': patch
+---
+
+Moved over implementation of the root HTTP service from `@backstage/backend-common`, and replaced the `middleware` option with a `configure` callback option.

.changeset/kind-badgers-know.md

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+---
+'@backstage/backend-tasks': patch
+---
+
+Minor internal refactor to avoid import cycle issue.

.changeset/orange-spoons-approve.md

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+---
+'@backstage/backend-common': patch
+---
+
+Refactor to rely on `@backstage/backend-app-api` for the implementation of `createServiceBuilder`.