rancher-turtles: disable core provider pre-delete hook

[hardys]

This can fail when install fails prior to installing the Namespace leaving the chart in an uninstallable state

    + helm_v3 uninstall rancher-turtles --namespace rancher-turtles-system --wait
    Error: warning: Hook pre-delete rancher-turtles/templates/core-provider.yaml failed: 1 error occurred:
            * namespaces "capi-system" not found

This can arise when installing via the RKE2 helm controller if cert-manager is not yet ready:

+ helm_v3 install --namespace rancher-turtles-system --create-namespace --version 0.3.1+up0.11.0 rancher-turtles /tmp/rancher-turtles.tgz --values /config/values-01_HelmChart.yaml
Error: INSTALLATION FAILED: 2 errors occurred:
	* Internal error occurred: failed calling webhook "webhook.cert-manager.io": failed to call webhook: Post "https://cert-manager-webhook.cert-manager.svc:443/validate?timeout=30s": no endpoints available for service "cert-manager-webhook"
	* Internal error occurred: failed calling webhook "webhook.cert-manager.io": failed to call webhook: Post "https://cert-manager-webhook.cert-manager.svc:443/validate?timeout=30s": no endpoints available for service "cert-manager-webhook"

In this situation we don't require cleanup, we just need the chart to uninstall cleanly so the helm controller can try again and eventually succeed when cert-manager is ready.

[hardys]

A preview of this is available for testing at https://hardys.github.io/charts/

[fdegir]

Initial tests passed and will run additional tests to confirm.

[dprodanov4]

Tested in Stack Validation and deployment was successful. LGTM!

[fdegir]

Worked in airgapped environment as well!