Fixed missing Kubernetes host version when specified

[enrichman]

Fix #584

When the Kubernetes version was specified in the Cluster spec we were not checking the Kubernetes host version.
Because of this the check for the Cluster reconciliation from the k3kcli was failing, when trying to create a virtual cluster with the version specified.

This PR will check the Kubernetes host version even when the virtual cluster version is specified, the behavior will be the same though. A new K3sVersion func was added, because it will be probably useful in other circumstances (see #571 (review)).

This PR will also fix #583

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.78%. Comparing base (5c49c3d) to head (8412e06).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #585      +/-   ##
==========================================
+ Coverage   58.75%   58.78%   +0.02%     
==========================================
  Files          56       56              
  Lines        5315     5316       +1     
==========================================
+ Hits         3123     3125       +2     
  Misses       1900     1900              
+ Partials      292      291       -1     

Flag	Coverage Δ
cli	53.66% <90.90%> (+0.67%)	⬆️
controller	57.01% <90.90%> (+0.03%)	⬆️
e2e	57.01% <90.90%> (+0.03%)	⬆️
unit	35.97% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.