Update scripts SHA 2025-12-03 and update github actions runners.

[BillyONeal]

• Update the scripts SHA to that for 2025-12-03
• That broke several tests due to the change in Ninja version
• In order to fix that I updated the tests to ensure we were not triggering cross compilation unless we were actually intending to do that; for example we were selecting x64-osx even though arm64-osx is the 'normal' osx now.
• That change in expected triplet itself broke a lot of tests resulting in most of the edits here.
• Updating macOS and Ubuntu runners to 26/24.04 the stock GitHub Actions runners don't include a mono installation for the NuGet tests, so getting that on the boxes before running the e2e tests is done here.

In general the most impactful change is that we usually need to make a triplet with our expected changes on the fly rather than trying to make checked in test triplets. In particular detecting whether we are on arm64 is difficult because CMAKE_HOST_SYSTEM_PROCESSOR is not set before project() (as is normally the case in a triplet)