Handle CA certificates for turtles manager to avoid Pending state of CAPI cluster after importing to Rancher

[thehejik]

What would you like to be added (User Story)?

It looks more and more people is trying to install turtles into rancher but they are facing an initial issue with Pending clusters after provisioning and importing into rancher.

We should give them a guidance via doc and/or add a value/question into turtles helm chart/App to either mount/import rancher's known CA certificate or append --insecure-skip-verify=true as additional manager argument in its Deployment.

The capi manager deployment where the extra argument should be added is called rancher-turtles-controller-manager in rancher-turtles-system namespace.

Label(s) to be applied

/kind feature

[kkaempf]

release-notes maybe ?