migrate dependencies to vcpkg

[tgauth]

PR Summary

• update build to consume dependencies (libcbor, libfido2, libressl, and zlib) from vcpkg
• update CI to clone vcpkg repo, parse warnings from build logs, and check that libressl version in resource.h file (version used for populating DLL properties) matches version in vcpkg.json (actual version being built)
• update build instructions wiki page to include vcpkg install instructions as a pre-requisite

PR Context

• simplify dependency consumption
• to build going forward, the assumption will be that the vcpkg repo is also cloned to the machine, bootstrapped, and integrated with Visual Studio, see https://github.com/PowerShell/Win32-OpenSSH/wiki/Building-OpenSSH-for-Windows-(using-LibreSSL-crypto) for instructions

[tgauth]

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[Copilot]

Pull Request Overview

This PR migrates the project’s dependency management to use vcpkg, updating the build and CI processes accordingly. Key changes include:

• Cloning and bootstrapping vcpkg for dependency management.
• Adding build steps for ARM architectures (arm64 and arm).
• Parsing and surfacing additional warnings from build logs for all supported platforms.

Files not reviewed (19)

• contrib/win32/openssh/AzDOBuildTools/AzDOBuildTools.psm1: Language not supported
• contrib/win32/openssh/OpenSSHBuildHelper.psm1: Language not supported
• contrib/win32/openssh/config.vcxproj: Language not supported
• contrib/win32/openssh/keygen.vcxproj: Language not supported
• contrib/win32/openssh/libssh.vcxproj: Language not supported
• contrib/win32/openssh/libssh.vcxproj.filters: Language not supported
• contrib/win32/openssh/openbsd_compat.vcxproj: Language not supported
• contrib/win32/openssh/paths.targets: Language not supported
• contrib/win32/openssh/scp.vcxproj: Language not supported
• contrib/win32/openssh/sftp-server.vcxproj: Language not supported
• contrib/win32/openssh/sftp.vcxproj: Language not supported
• contrib/win32/openssh/ssh-add.vcxproj: Language not supported
• contrib/win32/openssh/ssh-agent.vcxproj: Language not supported
• contrib/win32/openssh/ssh-keyscan.vcxproj: Language not supported
• contrib/win32/openssh/ssh-pkcs11-helper.vcxproj: Language not supported
• contrib/win32/openssh/ssh-shellhost.vcxproj: Language not supported
• contrib/win32/openssh/ssh-sk-helper.vcxproj: Language not supported
• contrib/win32/openssh/ssh.vcxproj: Language not supported
• contrib/win32/openssh/sshd-session.vcxproj: Language not supported

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[vthiebaut10]

LGTM