[jeremydmiller]

Release gate for 6.56.0. This PR's CI is the one full run for the release. The fix PRs below were merged on local gates with their CI cancelled.

• GH-5235 Runtime shutdown and agent removal wait for an in-flight metrics query #5239 PersistenceMetricsSweeper outlives host shutdown and accesses disposed Npgsql data source #5235 Runtime shutdown and agent removal wait for an in-flight metrics query
• GH-5236 Kafka DeferAsync no longer re-enters the receiver inline #5240 Stack overflow in Kafka durable inbox when SQL Server is unavailable #5236 Kafka DeferAsync no longer re-enters the receiver inline
• GH-5237 CloudEvents single-envelope send fails on a rejected response #5241 WolverineHttpTransportClientCloudEvents.SendAsync ignores the response status, so a rejected send counts as delivered #5237 CloudEvents single-envelope send fails on a rejected response
• GH-5238 opts.UseHttpTransport(), and /invoke answers 415 for an unknown content type #5242 HTTP transport is only registered by ToHttpEndpoint(): http(s) URIs from ListenForMessagesFrom / Publish.To / EndpointFor fail with "Unknown Transport scheme 'http'" #5238 opts.UseHttpTransport(), and /invoke answers 415 for an unknown content type (new public API, hence the minor)

./build.sh Pack ran clean locally.

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