[release-branch.go1.26] - update openssl backend to point to new location

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[Copilot]

Pull request overview

This PR updates the Microsoft Go 1.26 release-branch patch set and documentation to point the Linux OpenSSL crypto backend at its new repository/module location (github.com/microsoft/go-crypto-openssl) instead of golang-fips/openssl/v2.

Changes:

• Update patch files to use the new go-crypto-openssl import paths and vendor paths.
• Update FIPS docs to reference go-crypto-openssl as the OpenSSL backend.
• Update the internal eng/_util/cmd/upgrader dependency metadata to fetch/update the new OpenSSL backend repository.

Show a summary per file

File	Description
patches/0004-Use-crypto-backends.patch	Updates vendored package paths and a test-script comment to reference go-crypto-openssl.
patches/0003-Implement-crypto-internal-backend.patch	Repoints OpenSSL backend imports to go-crypto-openssl and adjusts OpenSSL init-time FIPS checks/error reporting.
eng/doc/fips/UserGuide.md	Updates backend references/links to the new OpenSSL backend repo and includes macOS backend reference.
eng/doc/fips/README.md	Updates OpenSSL backend documentation references/links to the new location.
eng/_util/cmd/upgrader/main.go	Updates the upgrader’s OpenSSL dependency metadata to the new repo/module/ref.

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• Files reviewed: 5/6 changed files
• Comments generated: 2