Add Windows Server 2025 support and remove WS2019 from CI matrix

[Copilot]

This PR updates the GitHub Actions CI matrix to remove Windows Server 2019 (which has been removed from GitHub's hosted runners) and adds support for Windows Server 2025 as requested.

Changes Made

• Removed 2019 from the CI matrix as the WS2019 image is no longer available on GitHub-hosted runners
• Added 2025 to both build and functional test matrices to support Windows Server 2025
• Enhanced local development support by adding VS 2022 BuildTools path detection in tools/common.ps1
• Preserved existing VS 2019 BuildTools path detection for backward compatibility

Impact

The CI matrix now tests on both Windows Server 2022 and Windows Server 2025:

• Build jobs: 8 combinations (2 os × 2 configuration × 2 platform)
• Functional tests: 8 combinations (2 os × 2 apimode × 2 configuration × 1 platform)

Build artifacts continue to be generated from Windows Server 2022 to maintain compatibility with downstream consumers while expanding test coverage to include the latest Windows Server version.

Fixes #174.

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[mtfriesen]

@copilot please add ws2025 too

[Copilot]

@copilot please add ws2025 too

Added Windows Server 2025 support to both the build and functional test matrices. The CI will now test on both WS2022 and WS2025, expanding coverage while keeping WS2022 as the primary artifact source. Also enhanced local development support by adding VS 2022 BuildTools path detection. (d1379e1)

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