feat: upgrade Helm version to v3.20.0 and v4.1.0 (#2373)

* feat: upgrade Helm version to v3.20.0 and v4.1.0

This commit updates the recommended Helm version from v3.19.5/v4.0.5 to
v3.20.0/v4.1.0 across all workflows, Dockerfiles, and application constants.

Changes:
- Update CI matrix to test with Helm v3.20.0 and v4.1.0
- Update .github/workflows/Makefile HELM_VERSION to v4.1.0
- Update Dockerfiles with new version and SHA256 checksums
- Update pkg/app/init.go HelmRecommendedVersion to v4.1.0
- Update go.mod helm.sh/helm/v3 to v3.20.0 and helm.sh/helm/v4 to v4.1.0

Signed-off-by: yxxhero <aiopsclub@163.com>

* fix: remove source field from e2e test helm plugin configs

Signed-off-by: yxxhero <aiopsclub@163.com>

* fix: remove source field from integration test helm plugin config

Signed-off-by: yxxhero <aiopsclub@163.com>

---------

Signed-off-by: yxxhero <aiopsclub@163.com>

.github/workflows/Makefile

@@ -1,4 +1,4 @@
-HELM_VERSION ?= v4.0.5
+HELM_VERSION ?= v4.1.0
 KUSTOMIZE_VERSION ?= v5.8.0
 K8S_VERSION ?= v1.34.0
 MINIKUBE_VERSION ?= v1.37.0