Change chart to only set matchConditions on webhooks when the value parameter is not empty

[martijnvdp]

Describe the solution you'd like

would be nice if the following statements only set this matchConditions if the value .Values.validatingWebhookMatchConditions is not [] empty

kind: ValidatingWebhookConfiguration
  {{- if ge (int .Capabilities.KubeVersion.Minor) 28 }}
  matchConditions: {{ toYaml .Values.validatingWebhookMatchConditions | nindent 4 }}
  {{- end }}

due a bug in argocd i am getting an error in argocd due this new setting:

Failed to compare desired state to live state: failed to perform pre-diff normalization: error building typed results: error creating typedConfig: .webhooks[name="validation.gatekeeper.sh"].matchConditions: field not declared in schema

see issue: https://github.com/argoproj/gitops-engine/issues/558

but i'm not even using this parameter so as a workaround it would be nice if the chart left this parameter out when .values.validatingWebhookMatchConditions : [] same for mutatingWebhookMatchConditions

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.]

Environment:

• Gatekeeper version: 3.16.3
• Kubernetes version: 1.28
• Argo v2.10.1+a79e0ea