Allow dev builds to use OfficialBuildId when explicitly set

[ViktorHofer]

The VMR currently has a model that allows to build locally (meaning ContinuousIntegrationBuild=false) but use official build versioning. This is currently not supported by the Arcade SDK versioning infrastructure.

This fixes the broken VMR dev builds: https://github.com/dotnet/source-build/issues/4689

Validated offline when building the VMR. This feels like the correct fix to me anyway as we should be able to produce official build versioned packages on dev builds for local validation. Our source-build partners might eventually want/need this as well.

To double check:

• [ ] The right tests are in and the right validation has happened. Guidance: https://github.com/dotnet/arcade/blob/main/Documentation/Validation.md