dist: Add required "group(kvm)" for openQA-worker

[okurz]

openSUSE Factory since about 20240928 seems to need an explicit addition
of the "kvm" group. This commit tries to fix that same as we do with
"nogroup".

Related progress issue: https://progress.opensuse.org/issues/167587

[okurz]

@Vogtinator @DimStar77 can you say if this is the right approach to fix

usermod: group 'kvm' does not exist

in the openSUSE Factory build or do you have another suggestion?

[Vogtinator]

sysusers.d says: Add a user to a group. If the user or group do not exist yet, they will be implicitly created.

[DimStar77]

Ensuring the group is properly pulled in when using it does sound correct to me

[Vogtinator]

So arguably a bug in whatever reads the sysusers.d file there, but IMO requiring the proper group is the better option.

We can't use the RPM native sysusers.d support and sysuser-tools doesn't generate requires, so I think this is the correct fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.75%. Comparing base (d5e5ab9) to head (1acf501).
Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5968      +/-   ##
==========================================
- Coverage   98.75%   98.75%   -0.01%     
==========================================
  Files         396      396              
  Lines       38966    38966              
==========================================
- Hits        38482    38479       -3     
- Misses        484      487       +3     

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