[msbuild] Fix dirty working copy with Errors.designer.cs.

[rolfbjarne]

The Xamarin.MacDev.Tasks.sln solution is built with dotnet, while other projects
are still built with msbuild. This becomes a problem when generating Errors.designer.cs,
because depending on the runtime the output is different.

This means that the Errors.designer.cs will sometimes randomly change (depending
on which project re-generated the file), leaving the file modified in git. This is
quite annoying, but it also breaks the api comparison, which depends on the build
not leaving modified files behind. So for now, we generate Errors.designer.cs separately
for Xamarin.MacDev.Tasks.sln to not conflict with the mtouch version.

Also fix capitalization in numerous places to be consistent (it's Errors.designer.cs,
not Errors.Designer.cs).

[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: 782324b8646b68ebd2225c5cd7395a3150cfff90 [PR build]

[vs-mobiletools-engineering-service2]

📚 [PR Build] Artifacts 📚

Packages generated

View packages

• Microsoft.iOS.Bundle.15.4.576-ci.pr.gh16404.pkg
• Microsoft.iOS.Ref.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Runtime.ios-arm.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Runtime.ios-arm64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Runtime.iossimulator-arm64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Runtime.iossimulator-x64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Runtime.iossimulator-x86.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Sdk.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Templates.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.iOS.Windows.Sdk.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.MacCatalyst.Bundle.15.4.576-ci.pr.gh16404.pkg
• Microsoft.MacCatalyst.Ref.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-arm64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.MacCatalyst.Runtime.maccatalyst-x64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.MacCatalyst.Sdk.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.MacCatalyst.Templates.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.macOS.Bundle.12.3.576-ci.pr.gh16404.pkg
• Microsoft.macOS.Ref.12.3.576-ci.pr.gh16404.nupkg
• Microsoft.macOS.Runtime.osx-arm64.12.3.576-ci.pr.gh16404.nupkg
• Microsoft.macOS.Runtime.osx-x64.12.3.576-ci.pr.gh16404.nupkg
• Microsoft.macOS.Sdk.12.3.576-ci.pr.gh16404.nupkg
• Microsoft.macOS.Templates.12.3.576-ci.pr.gh16404.nupkg
• Microsoft.NET.Sdk.iOS.Manifest-6.0.400.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.400.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.NET.Sdk.macOS.Manifest-6.0.400.12.3.576-ci.pr.gh16404.nupkg
• Microsoft.NET.Sdk.tvOS.Manifest-6.0.400.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.NET.Workload.iOS.15.4.576-ci.pr.gh16404.msi
• Microsoft.tvOS.Bundle.15.4.576-ci.pr.gh16404.pkg
• Microsoft.tvOS.Ref.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.tvOS.Runtime.tvos-arm64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-arm64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.tvOS.Runtime.tvossimulator-x64.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.tvOS.Sdk.15.4.576-ci.pr.gh16404.nupkg
• Microsoft.tvOS.Templates.15.4.576-ci.pr.gh16404.nupkg
• xamarin.ios-15.13.0.272.pkg
• xamarin.mac-8.13.0.272.pkg

Pipeline on Agent XAMBOT-1109.Monterey'
Hash: 782324b8646b68ebd2225c5cd7395a3150cfff90 [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: 782324b8646b68ebd2225c5cd7395a3150cfff90 [PR build]

[vs-mobiletools-engineering-service2]

🚀 [CI Build] Test results 🚀

Test results

✅ All tests passed on VSTS: simulator tests.

🎉 All 223 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. 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 23 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: [PR build]