Use --kubeconfig=/tmp/kubeconfig to avoid modifying /opt/kubeconfig with kubeadmin token

[praveenkumar]

Currently, the crc-cluster-status.sh script logs into OpenShift using the kubeadmin account, which writes authentication tokens to the default kubeconfig file at /opt/kubeconfig. This results in kubeadmin token entries adding to the system:admin kubeconfig file, where the tokens eventually expire and may cause authentication or usability issues for system administrators.

Proposal:

• Use --kubeconfig=/tmp/kubeconfig as a flag during oc login with the kubeadmin user.
• This ensures the kubeadmin token is isolated in a temporary file, separate from the permanent system:admin kubeconfig in /opt/kubeconfig.
• Prevents unnecessary token entries in the main kubeconfig and avoids future token expiration issues for system administrators who depend on /opt/kubeconfig as their main system:admin configuration.

This change improves token management and prevents accidental pollution or issues with privileged kubeconfig files.