fix: deprecate kubernetes-version flag in vcluster create

[kale-amruta]

What issue type does this pull request address? (keep at least one, remove the others)
/kind bugfix

What does this pull request do? Which issues does it resolve? (use resolves #<issue_number> if possible)
resolves #2294

Please provide a short message that should be published in the vcluster release notes
Deprecated the kubernetes-version flag in vcluster createcommand, kubernetes version can now be configured from values.yaml.

What else do we need to know?

Deprecation note:

vcluster create v3 --kubernetes-version 1.27.16
Flag --kubernetes-version has been deprecated, please specify the kubernetes version by setting "controlPlane.distro.k8s.version" accordingly via values.yaml file.
17:17:45 info Using vCluster driver 'helm' to create your virtual clusters, which means the vCluster CLI is running helm commands directly

Since the flag is deprecated, the warning related to only supporting major.minor is also removed which will no longer makes sense.

[netlify]

✅ Deploy Preview for vcluster-docs canceled.

Built without sensitive environment variables

Name	Link
🔨 Latest commit	f459b87
🔍 Latest deploy log	https://app.netlify.com/sites/vcluster-docs/deploys/677fb949ad1d4700084736a9