Update mk_inventory.vbs to include UBR in Windows OS version

[gabrielgbs97]

Retrieve minor windows version, this is useful to quickly know patch level among hosts.

See: https://ideas.checkmk.com/suggestions/484201/windows-mk_inventoryvbs-add-ubr-to-kernel-version

General information

Modified mk_inventory.vbs script to include full windows os version.

Bug reports

https://ideas.checkmk.com/suggestions/484201/windows-mk_inventoryvbs-add-ubr-to-kernel-version

Proposed changes

Query the registry in the same manner as in other parts of the script. I did not modify getWMIObject2, but rather rewrote a specific version of it to keep the code clean.

• What is the expected behavior?
  Retrieve Full windows version
• What is observed behavior?
  WMI inherently collects only the major build number, for instance, Windows 10 1809 corresponds to 10.0.17763. However, the complete version including the LCU would be 10.0.17763.6054.
• If it's not obvious from the above: In what way does your patch change the current behavior?
  It queries registry for UBR number with existing object in the script to reutilize it. If UBR is not available, it does not append anything.
• Consider writing a unit test that would have failed without your fix.
• Is this a new problem? What made you submit this PR (new firmware, new device, changed device behavior)?

[github-actions]

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[gabrielgbs97]

I have read the CLA Document and I hereby sign the CLA or my organization already has a signed CLA.

[gabrielgbs97]

recheck