remove support for non-distributable artifacts and deprecate API fields and config

Non-distributable artifacts (foreign layers) were introduced in commit
05bd04350b to accommodate Windows images,
for which the EULA did not allow layers to be distributed through registries
other than those hosted by Microsoft. The concept of foreign / non-distributable
layers was adopted by the OCI distribution spec in [oci#233].

These restrictions were relaxed later to allow distributing these images
through non-public registries, for which a configuration was added in the
daemon in 67fdf574d5. In 2022, Microsoft updated
the EULA and [removed these restrictions altogether][1], and the OCI distribution
spec deprecated the  functionality in [oci#965].

In 2023, Microsoft [removed the use of foreign data layers][2] for their images,
making this functionality obsolete.

This patch:

- Deprecates the `--allow-nondistributable-artifacts` daemon flag and corresponding
  `allow-nondistributable-artifacts` field in `daemon.json`. Setting either
  option will no longer take an effect, but a deprecation warning log is added
  to raise awareness about the deprecation. This warning is planned to become
  an error in the next release.
- Deprecates the `RegistryConfig.AllowNondistributableArtifactsCIDRs` and
  `RegistryConfig.AllowNondistributableArtifactsHostnames` fields in the
  `GET /info` API response. For API version v1.48 and lower, the fields are
  still included in the response, but always `null`. In API version v1.49 and
  higher, the field will be omitted entirely.
- Deprecates the `api/types/registry/ServiceConfig.AllowNondistributableArtifactsCIDRs`
  field.
- Deprecates the `api/types/registry/ServiceConfig.AllowNondistributableArtifactsHostnames`
  field.
- Deprecates the `registry.ServiceOptions.AllowNondistributableArtifacts` field.

[oci#233]: https://github.com/opencontainers/image-spec/pull/233
[oci#965]: https://github.com/opencontainers/image-spec/pull/965
[1]: https://techcommunity.microsoft.com/blog/containers/announcing-windows-container-base-image-redistribution-rights-change/3645201
[2]: https://techcommunity.microsoft.com/blog/containers/announcing-removal-of-foreign-layers-from-windows-container-images/3846833

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/api/version-history.md

@@ -17,6 +17,11 @@ keywords: "API, Docker, rcli, REST, documentation"
 
 [Docker Engine API v1.48](https://docs.docker.com/reference/api/engine/version/v1.48/) documentation
 
+# Deprecated: The "allow-nondistributable-artifacts" daemon configuration is
+  deprecated and enabled by default. The  `AllowNondistributableArtifactsCIDRs`
+  and `AllowNondistributableArtifactsHostnames` fields in the `RegistryConfig`
+  struct in the `GET /info` response will now always be `null` and will be
+  omitted in API v1.49.
 * `GET /images/{name}/history` now supports a `platform` parameter (JSON
   encoded OCI Platform type) that allows to specify a platform to show the
   history of.