chore(Windows): log the list of tag(s) to be built

[lemeurherve]

This PR adds to the build logs a listing of the Windows tags that will be built, like what has been added to https://github.com/jenkinsci/docker-agent and https://github.com/jenkinsci/docker-inbound-agent build process.

Output:

= PREPARE: List of jenkins4eval/jenkins images and tags to be processed:
 {
     "jdk11-hotspot-windowsservercore-2019":  {
                                                  "Folder":  "11\\windows\\windowsservercore-2019\\hotspot",
                                                  "Tags":  [
                                                               "jdk11-hotspot-windowsservercore-2019"
                                                           ]
                                              }
 }

Testing done

pwsh make.ps1 and CI build.

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