Allow dots to be used when cilium install is executed

[amilanoski]

Proposal / RFE

Is your feature request related to a problem? Yes

Describe the solution you'd like Support using cilium cli where the cluster has dot in the name other command like cilium connectivity test can connect and work fine.

(⎈ |eks1.dev.xxxx.xx.aws:default)➜  cilium cilium install hubble
ℹ️  using Cilium version "v1.9.8"
🔮 Auto-detected cluster name: eks1.dev.xxxx.xx.aws
🔮 Auto-detected IPAM mode: cluster-pool
❌ Cluster name "eks1.dev.xxxx.xx.aws" cannot contain dots
↩️ Rolling back installation...

Error: Unable to install Cilium: invalid cluster name, dots are not allowed

[samgty]

+1 for this feature 👍