[src] Unify build code for .NET platforms.

[rolfbjarne]

Use a make template for the build logic for our platform assemblies, so that we don't
unintentionally have slightly different build code for different platforms (especially
when making changes to the build this way ensures that we make the same change on all
platforms).

This also makes the code significantly shorter, and will make it easier to add more
platforms in the future if we ever need that.

[rolfbjarne]

Depends on #17452 to be merged first for tests to not be failing.

[vs-mobiletools-engineering-service2]

✅ API diff for current PR / commit

Legacy Xamarin (No breaking changes)

• iOS (no change detected)
• tvOS (no change detected)
• watchOS (no change detected)
• macOS (no change detected)

NET (empty diffs)

• iOS: (empty diff detected)
• tvOS: (empty diff detected)
• MacCatalyst: (empty diff detected)
• macOS: (empty diff detected)

✅ API diff vs stable

Legacy Xamarin (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• watchOS: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)

.NET (No breaking changes)

• iOS: vsdrops gist (No breaking changes)
• tvOS: vsdrops gist (No breaking changes)
• MacCatalyst: vsdrops gist (No breaking changes)
• macOS: vsdrops gist (No breaking changes)
• Microsoft.iOS vs Microsoft.MacCatalyst: vsdrops gist

Legacy Xamarin (stable) vs .NET

• iOS: vsdrops gist
• tvOS: vsdrops gist
• macOS: vsdrops gist

✅ Generator diff

Generator diff is empty

Pipeline on Agent
Hash: 105e3a5f5731c6e2fed4fd05f0208489f107b6f7 [PR build]

[vs-mobiletools-engineering-service2]

💻 [PR Build] Tests on macOS M1 - Mac Big Sur (11.5) passed 💻

✅ All tests on macOS M1 - Mac Big Sur (11.5) passed.

Pipeline on Agent
Hash: 105e3a5f5731c6e2fed4fd05f0208489f107b6f7 [PR build]

[vs-mobiletools-engineering-service2]

📚 [PR Build] Artifacts 📚

Packages generated

View packages

• Microsoft.iOS.Bundle.16.2.164-ci.pr.gh17445.pkg
• Microsoft.iOS.Ref.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Runtime.ios-arm.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Runtime.ios-arm64.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Sdk.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Templates.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.iOS.Windows.Sdk.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.MacCatalyst.Bundle.16.2.164-ci.pr.gh17445.pkg
• Microsoft.MacCatalyst.Ref.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.MacCatalyst.Sdk.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.MacCatalyst.Templates.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.macOS.Bundle.13.1.164-ci.pr.gh17445.pkg
• Microsoft.macOS.Ref.13.1.164-ci.pr.gh17445.nupkg
• Microsoft.macOS.Runtime.osx-arm64.13.1.164-ci.pr.gh17445.nupkg
• Microsoft.macOS.Runtime.osx-x64.13.1.164-ci.pr.gh17445.nupkg
• Microsoft.macOS.Sdk.13.1.164-ci.pr.gh17445.nupkg
• Microsoft.macOS.Templates.13.1.164-ci.pr.gh17445.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-7.0.100.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-7.0.100.16.2.164-ci.pr.gh17445.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-7.0.100.13.1.164-ci.pr.gh17445.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-7.0.100.16.1.952-ci.pr.gh17445.nupkg
• Microsoft.NET.Workload.iOS.16.2.164-ci.pr.gh17445.msi
• Microsoft.tvOS.Bundle.16.1.952-ci.pr.gh17445.pkg
• Microsoft.tvOS.Ref.16.1.952-ci.pr.gh17445.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.16.1.952-ci.pr.gh17445.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.16.1.952-ci.pr.gh17445.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.16.1.952-ci.pr.gh17445.nupkg
• Microsoft.tvOS.Sdk.16.1.952-ci.pr.gh17445.nupkg
• Microsoft.tvOS.Templates.16.1.952-ci.pr.gh17445.nupkg
• xamarin.ios-16.2.1.164.pkg
• xamarin.mac-9.1.1.164.pkg

Pipeline on Agent XAMBOT-1096.Monterey'
Hash: 105e3a5f5731c6e2fed4fd05f0208489f107b6f7 [PR build]

[mandel-macaque]

@rolfbjarne AFIAK it is ok to land, but a triggered a run for the failing tests.

[vs-mobiletools-engineering-service2]

🚀 [CI Build] Test results 🚀

Test results

✅ All tests passed on VSTS: simulator tests.

🎉 All 225 tests passed 🎉

Tests counts

✅ bcl: All 69 tests passed. Html Report (VSDrops) Download
✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests: All 1 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 7 tests passed. Html Report (VSDrops) Download
✅ framework: All 8 tests passed. Html Report (VSDrops) Download
✅ generator: All 2 tests passed. Html Report (VSDrops) Download
✅ interdependent_binding_projects: All 7 tests passed. Html Report (VSDrops) Download
✅ install_source: All 1 tests passed. Html Report (VSDrops) Download
✅ introspection: All 8 tests passed. Html Report (VSDrops) Download
✅ linker: All 65 tests passed. [attempt 3] Html Report (VSDrops) Download
✅ mac_binding_project: All 1 tests passed. Html Report (VSDrops) Download
✅ mmp: All 2 tests passed. Html Report (VSDrops) Download
✅ mononative: All 12 tests passed. Html Report (VSDrops) Download
✅ monotouch: All 25 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ mtouch: All 1 tests passed. Html Report (VSDrops) Download
✅ xammac: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 8 tests passed. Html Report (VSDrops) Download
✅ xtro: All 2 tests passed. Html Report (VSDrops) Download

Pipeline on Agent
Hash: 105e3a5f5731c6e2fed4fd05f0208489f107b6f7 [PR build]