Add Visual Studio 2026 support in CI pipelines and CLI#15415

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Copilot wants to merge 12 commits intomainfrom

copilot/fix-missing-vs2026-support

Commits on Nov 27, 2025

Initial plan
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Update CI pipeline to support Visual Studio 2026

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Update rnw-dependencies.ps1 to support VS2026

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Add change file for VS2026 CI pipeline updates

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Revert to VS2022 images as VS2026 image doesn't exist in agent pools yet

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Revert back to VS2026 CI pipeline configuration

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Update msbuildtools to detect both VS2022 and VS2026

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Add change file for @react-native-windows/cli VS2026 support

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