Duplicated Keys in cosigned template

[david-freistrom]

Description

You defined duplicated keys in deployment_policy_webhook.yaml for the cosigned helm chart which results in an error while using fluxcd HelmRelease.

If you just use Helm, helm will ignore duplicated keys but fluxcd yaml parser is sensitive and exit with

Helm install failed: error while running post render on files: map[string]interface {}(nil): yaml: unmarshal errors: line 43: mapping key "serviceAccountName" already defined at line 31 line 113: mapping key "terminationGracePeriodSeconds" already defined at line 32

fluxcd/flux2#1522