fix(api/types): map HelmChartArgs.ReleaseNamespace -> HelmChart.Namespace

[SAY-5]

Fixes #4593.

Problem

Kustomizations using the (deprecated) helmChartInflationGenerator field with releaseNamespace silently emit resources into the default namespace instead of the requested one:

helmChartInflationGenerator:
  - chartName: nats
    chartVersion: v0.13.1
    chartRepoUrl: https://nats-io.github.io/k8s/helm/charts
    releaseName: nats
    releaseNamespace: custom-ns   # ← ignored

Root cause

SplitHelmParameters translates every HelmChartArgs (deprecated) into a HelmChart (current) via makeHelmChartFromHca. That translator was missing one field:

func makeHelmChartFromHca(old *HelmChartArgs) (c HelmChart) {
    c.Name         = old.ChartName
    c.Version      = old.ChartVersion
    c.Repo         = old.ChartRepoURL
    c.ValuesFile   = old.Values
    c.ValuesInline = old.ValuesLocal
    c.ValuesMerge  = old.ValuesMerge
    c.ReleaseName  = old.ReleaseName
    // <-- ReleaseNamespace was never copied onto c.Namespace
    return
}

HelmChart.Namespace is what later gets passed as --namespace to helm template in AsHelmArgs, so when it was left empty the chart was rendered against default.

Fix

Copy old.ReleaseNamespace into c.Namespace. One-line change; preserves full backward compatibility with any user that was relying on the broken behaviour (they were never getting the namespace they asked for in the first place).

Test

Added TestSplitHelmParametersPropagatesReleaseNamespace in api/types/helmchartargs_test.go, which directly asserts the mapping:

args := []types.HelmChartArgs{{
    ChartName:        "nats",
    ChartVersion:     "v0.13.1",
    ReleaseName:      "nats",
    ReleaseNamespace: "custom-ns",
}}
charts, _ := types.SplitHelmParameters(args)
require.Equal(t, "custom-ns", charts[0].Namespace)

Signed-off per DCO.

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