Flag --incompatible_config_setting_private_default_visibility will break rules_dotnet in Bazel 7.0

[keertk]

Incompatible flag --incompatible_config_setting_private_default_visibility will be enabled by default in the next major release (Bazel 7.0), thus breaking rules_dotnet. Please migrate to fix this and unblock the flip of this flag.

The flag is documented here: bazelbuild/bazel#12933.

Please check the following CI builds for build and test results:

• MacOS OpenJDK 11
• Ubuntu 16.04, OpenJDK 8
• Ubuntu 18.04, OpenJDK 11
• Windows OpenJDK 11
• Ubuntu 16.04, OpenJDK 8
• Ubuntu 18.04, OpenJDK 11
• MacOS OpenJDK 11
• Windows OpenJDK 11

E.g.

(01:13:35) INFO: ToolchainResolution: Target platform @buildkite_config//config:platform: Selected execution platform @buildkite_config//config:platform, type @rules_dotnet//dotnet:toolchain_type -> toolchain @dotnet_x86_64-unknown-linux-gnu//:dotnet_toolchain
--
  | (01:13:35) INFO: ToolchainResolution: Target platform @buildkite_config//config:platform: Selected execution platform @buildkite_config//config:platform,
  | (01:13:35) INFO: ToolchainResolution: Target platform @buildkite_config//config:platform: Selected execution platform @buildkite_config//config:platform,
  | (01:13:35) INFO: ToolchainResolution: Target platform @buildkite_config//config:platform: Selected execution platform @buildkite_config//config:platform,
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: in csharp_library rule //diamond:Bottom: target '@rules_dotnet//dotnet/private:linux-x64' is not visible from target '//diamond:Bottom'. Check the visibility declaration of the former target if you think the dependency is legitimate
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: in csharp_library rule //diamond:Bottom: target '@rules_dotnet//dotnet/private:linux-arm64' is not visible from target '//diamond:Bottom'. Check the visibility declaration of the former target if you think the dependency is legitimate
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: in csharp_library rule //diamond:Bottom: target '@rules_dotnet//dotnet/private:macos-x64' is not visible from target '//diamond:Bottom'. Check the visibility declaration of the former target if you think the dependency is legitimate
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: in csharp_library rule //diamond:Bottom: target '@rules_dotnet//dotnet/private:macos-arm64' is not visible from target '//diamond:Bottom'. Check the visibility declaration of the former target if you think the dependency is legitimate
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: in csharp_library rule //diamond:Bottom: target '@rules_dotnet//dotnet/private:windows-x64' is not visible from target '//diamond:Bottom'. Check the visibility declaration of the former target if you think the dependency is legitimate
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: in csharp_library rule //diamond:Bottom: target '@rules_dotnet//dotnet/private:windows-arm64' is not visible from target '//diamond:Bottom'. Check the visibility declaration of the former target if you think the dependency is legitimate
  | (01:13:35) ERROR: /var/lib/buildkite-agent/builds/bk-docker-bx9x/bazel-downstream-projects/rules_dotnet/examples/diamond/BUILD.bazel:32:15: Analysis of target '//diamond:Bottom' failed
  | (01:13:35) ERROR: Analysis of target '//diamond:Bottom' failed; build aborted:
  | (01:13:35) INFO: Elapsed time: 0.744s
  | (01:13:35) INFO: 0 processes.
  | (01:13:35) ERROR: Build did NOT complete successfully

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