Jenkins: Write the configuration for reproducing the VM environment into a .bat file

Currently the Jenkins build output contains a big section
"INFO:========== TO REPRODUCE THIS BUILD, COPY THE BELOW ==============="

Doing that does work, but it would be more convenient if the same would simply be written into a batch file in the home directory. Debugging issues on the VM would then just be logging in, running the .bat file, ready to go.

Note: That .bat file would just set up the environment, excluding running the build script like "%PKG_NODE_ROOT%\tqtc-qtsdk\jenkins-templates\projects%QTQA_PROJECT%\stages\script_win.bat" itself. There could of course be another .bat file that includes that too