[release-branch.go1.26] Include revision in Microsoft-specific version string

[dagood]

• Go 1.26.0-1 doesn't include revision in microsoft_toolset_version #2138
• Include revision in Microsoft-specific version string #2140

After pwsh eng/run.ps1 build, produces:

dagood@dagood-3:~/git/go1.26$ GODEBUG=ms_version=1 go/bin/go version
go version go1.26.0-1-microsoft linux/amd64
dagood@dagood-3:~/git/go1.26$ go/bin/go version -m go/bin/go
go/bin/go: go1.26.0
        path    cmd/go
        build   microsoft_toolset_version=go1.26.0-1-microsoft
[...]

[gdams]

@dagood if you rebase your changes you'll pick up my fix for the image name :)

[dagood]

Actually has more fundamental issues: #2140