Package Installation Fails on workload cluster with IAM Auth kubeconfig

**What happened**:
Installing package controller when using AWS IAM Auth kubeconfig returns the following error:
```
eksctl anywhere install packagecontroller -f $CLUSTER_NAME.yaml
Error: Unable to connect to the server: getting credentials: exec: executable aws-iam-authenticator not found

It looks like you are trying to use a client-go credential plugin that is not installed.

To learn more about this feature, consult the documentation available at:
https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins
```

**What you expected to happen**:
Package installation to work

**How to reproduce it (as minimally and precisely as possible)**:
Create a IAM Auth enabled workload cluster and set the `KUBECONFIG` env var to the IAM Auth kubeconfig

**Anything else we need to know?**:

**Environment**:
- EKS Anywhere Release: v0.11.1
- EKS Distro Release: v1.23

Start by reproducing the `eksctl anywhere install packagecontroller -f $CLUSTER_NAME.yaml` command with `KUBECONFIG` set to an IAM Auth workload-cluster kubeconfig, then trace the package-controller installation entry point and its client credential handling. Done means package installation succeeds without requiring an unavailable `aws-iam-authenticator` executable.

Written by the indexing model from the issue text.