See https://microsoft-my.sharepoint.com/:w:/p/mmitche/ERcEQy4Xex9CpRyTiGx9HrkBqf4iGDjDjwSk98QsczcROw?e=o0kVRO for more information on the DAC signing.

This involves augmenting the runtime build process to submit the DAC for signing in-line with the build.

We can probably start on this sooner rather than later. Does not require SignTool support.

The cross-os DAC build also needs to have this signing process included: #4631