ci: move helm release to the release-please workflow

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

Author: thomaspoignant

cmd/relayproxy/helm-charts/relay-proxy/Chart.yaml

@@ -5,8 +5,10 @@ sources:
   - "https://github.com/thomaspoignant/go-feature-flag"
 description: A Helm chart to deploy go-feature-flag-relay proxy into Kubernetes
 type: application
+# x-release-please-start-version
 version: 1.46.1
 appVersion: "v1.46.1"
+# x-release-please-end-version
 icon: https://raw.githubusercontent.com/thomaspoignant/go-feature-flag/main/logo.png
 maintainers:
   - name: thomaspoignant