[Arcade-Validation] Add some resx resources to the arcade-validation build to exercise the resource generation code path

- Is this issue blocking: no
- Is this issue causing unreasonable pain: no

This code path is currently not tested during the sdk validation, which led to some fallout from https://github.com/dotnet/arcade/pull/2208. Arcade-Validation can test this path and catch problems in the area before other repos get a potentially bad change.

See https://github.com/dotnet/arcade/blob/ff32e5111ec72af1b280186ae92c6090cb4585d4/Documentation/ArcadeSdk.md#generateresxsource-bool