Improve error handling in cluster install binary

[jaradtke-aws]

What would you like to be added: Improved error handling and reporting from eksanywhere installer

Why is this needed: I believe I have something wrong with my vSphere setup. (as this system is able to deploy EKS-A of the same version using bottlerocket - therefore, the eksanywhere binary would appear to be fine). It would be nicer/better if when the installer encounters an issue of some sort, if it could 1/ not display output that looks like it crashed 2/ inform the user of what issue was encountered.

Update: I believe it was erroring out due to the fact that I had replicated my kind: VSphereMachineConfig without giving the second instance a new name (i.e. I had 2 VSphereMachineConfig with the same name)

eksctl anywhere create cluster \
   -f  $CLUSTER_CONFIG
Warning: VSphereDatacenterConfig configured in insecure mode
Using the new workflow using the controller for management cluster create
Performing setup and validations
Closer failed	{"closerType": "*dependencies.Dependencies", "error": "govc returned error when logging out: govc: Post \"https://vsphere.kubernerdes.lab/sdk\": dial tcp: lookup vsphere.kubernerdes.lab on 127.0.0.53:53: no such host\n"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x148 pc=0x2cb023a]

goroutine 1 [running]:
github.com/aws/eks-anywhere/pkg/validations/createvalidations.(*CreateValidations).PreflightValidations(0xc00052d8d0, {0x3ccd898?, 0x56e8b60})
	github.com/aws/eks-anywhere/pkg/validations/createvalidations/preflightvalidations.go:72 +0xf1a