Fix unexpected Remoting V1 deprecation errors

[olegsych]

• Restore original behavior of the ActorRemotingProviderAttribute and ServiceRemotingProviderAttribute on NetStandard so that explicitly specifying a redundant assembly attribute is not required. The attribute is now required only on NetFx.
• Create NetFx test projects with the minimum set of tests for now to verify new NetFx behavior.
• Make build.yml use pre-installed .NET 9 and disable strong name verification to enable testing of the delay-signed NetFx assemblies.
• Make remoting provider error messages more descriptive.
• Make FabActUtil report exception messages as build errors and stack trace as build messages.
• Increment build number for integration in WindowsFabric repo.