Fission helm conflicts with Rancher

[sergeykorablin]

Fission/Kubernetes version

$ fission version

$ kubectl version
Client Version: v1.28.2
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.27.11+k3s1

Kubernetes platform (e.g. Google Kubernetes Engine)

Describe the bug

$ helm install --version v1.20.1 --namespace $FISSION_NAMESPACE fission fission-charts/fission-all
            
Error: INSTALLATION FAILED: rendered manifests contain a resource that already exists. 
Unable to continue with install: MutatingWebhookConfiguration "mutating-webhook-configuration" in namespace "" exists and cannot be imported into the current release: invalid ownership metadata;
label validation error: missing key "app.kubernetes.io/managed-by": must be set to "Helm";
annotation validation error: missing key "meta.helm.sh/release-name": must be set to "fission";
annotation validation error: missing key "meta.helm.sh/release-namespace": must be set to "fission"

https://github.com/rancher/rancher/blob/268d751c68b264e6f50a23d360d4699ca131768d/pkg/crds/provisioningv2/capi-webhooks.yaml#L6
uses the same name for MutatingWebhookConfiguration

To Reproduce

1. Install Rancher

helm install rancher rancher-latest/rancher \
  --namespace cattle-system \
  --set hostname=rancher.homelab.local \
  --set replicas=1 \
  --set bootstrapPassword=admin

2. Try to install Fission

helm install --version v1.20.1 --namespace fission fission fission-charts/fission-all

Expected result

Actual result

Screenshots/Dump file

$ fission support dump

Additional context

[robert-cronin]

This should just be a simple matter of choosing a unique name for the mutating webhook, perhaps I can give it a try? I think it is similar to #2825