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This change restores the serving of CORS headers in HTTP responses by pd. During the refactor of auto-https logic in #3652, we overlooked that the tower CorsLayer was no longer being carried through after type conversions between tower, tonic, and axum. Simply moving the layer attachment to the already-built axum router, rather than the previously constructed tonic router, resolves the problem.
We now include an integration test to check for the headers, so we don't inadvertently drop them again.
Closes #3865.