Build & release modernization

[xen2]

PR Details

Modernizes the build/release pipeline to run on dotnet build end-to-end, simplifies versioning, centralizes signing, and fixes a parallel-build correctness bug. No engine/runtime behavior changes — this is build, CI, and packaging.

Highlights

• Release & packaging via dotnet build. Release, NuGet packaging, and the VSIX build no longer need desktop MSBuild/devenv — the pipeline runs through build/Stride.build and works cross-platform. macOS/iOS platform wiring and an optional binlog switch included.

• Simplified versioning. Package version is now produced by a small inline MSBuild task (3-part semver major.minor.<patch>), replacing the vendored Nerdbank/libgit2 dependency (deps/Stride.GitVersioning removed). The patch is the next release number, derived from the releases/<major.minor>.* tags reachable from HEAD — so releases are clean and sequential (4.5.0, 4.5.1, …) and reset per major.minor bump. It's ancestor-scoped (branches, older builds, and fork-only tags can't skew it), all-local (works offline / with an unpushed HEAD), and dev builds share the same logic, falling back to the committed base with a git fetch/--unshallow hint when tags are missing. Prerelease suffixes (e.g. -beta) can be set from the release.yml dispatch -- no commit required, and the run surfaces the built version in the job list even when not deploying. A private prerelease feed (Azure DevOps Artifacts) is planned for hosting these beta builds, pending feed provisioning under the .NET Foundation.

• Centralized signing. All code-signing and AdvancedInstaller logic collapses into a single _SignFiles target and a single _BuildAdvancedInstaller target -- config/secret defined once, secret never placed on a command line. (Validated with a live signed dry-run.)

• Parallel-build fix. GraphicsApiDependentBuildAll no longer leaks the default Direct3D API onto single-API target frameworks (iOS/macOS/Android), eliminating a cross-targeting dispatch race that produced duplicate/colliding builds.

• gettext on net10. Updated to Stride.GNU.Gettext 3.0.0 (rebuilt msgfmt tool). Closes Update Gettext.Net to target .NET 10.0 #3113.

• CI improvements.

  • Comment-only PRs (whole-line ///# changes) skip all jobs while the gate still passes.
  • Test projects compile-skip in package builds — no test compilation / Android APK / AOT during packaging, substantially cutting package-build time (nobuild target was broken)
  • Nightly Visual Studio MSBuild build of Stride.sln for desktop-engine + MSVC native coverage.

• Cleanup. Removed dead build targets, made Clean portable, and dropped stale ToolsVersion/VS2013-era comments.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.