Enable ignition-gazebo CI on Windows

[j-rivero]

Together with the merge of gazebosim/gz-sim#585 it will enable the Windows CI on ignition-gazebo.
Partially fix #351

[j-rivero]

Tested here . No changes since the jobs were created by disabled.

Local run (first disabled is the one to look at):

release-tools/jenkins-scripts/dsl on  enable_ign_gazebo_win [?] ❯ grep disable ign_gazebo-*
ign_gazebo-ci-win.xml:    <disabled>false</disabled>
ign_gazebo-ci-win.xml:            <disabled>false</disabled>
ign_gazebo-ign-3-win.xml:    <disabled>true</disabled>
ign_gazebo-ign-3-win.xml:            <disabled>false</disabled>
ign_gazebo-ign-4-win.xml:    <disabled>true</disabled>
ign_gazebo-ign-4-win.xml:            <disabled>false</disabled>
ign_gazebo-pr-win.xml:    <disabled>false</disabled>
ign_gazebo-pr-win.xml:            <disabled>false</disabled>