deps: remove dependency on helm/v2

[daniel-weisse]

Context

We had a dependency on helm v2 through an incorrect import of helm.sh/helm/pkg/ignore instead of helm.sh/helm/v3/pkg/ignore. As far as I can tell this had no real impact on our code, yet its a dependency we do not need, since we already import helm v3, which offers the same package.

Proposed change(s)

• Replace import of helm.sh/helm/pkg/ignore with helm.sh/helm/v3/pkg/ignore to remove helm v2 from our dependencies

Related issue

• Fixes a go-vuln alert for https://pkg.go.dev/vuln/GO-2024-2575

Checklist

• [x] Run the E2E tests that are relevant to this PR's changes
  • [x] Azure e2e test

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Coverage report

Package	Old	New	Trend
internal/constellation/helm	33.60%	33.60%	:construction: