🐛 (helm/v2alpha): imagePullSecrets parsing in helm v2-alpha plugin

[zarcen]

The change is to bridge the gap of helm/v2alpha when using images in the private registry.
If users have private image and set imagePullSecrets in the original kustomize, it is not parsed and templated accordingly to helm.

This update allows manager Helm chart to take imagePullSecrets into account and generate the template for it.

Tests:

• I have read and followed CONTRIBUTING.md

1. Unit tests

go test ./pkg/plugins/optional/helm/v2alpha/scaffolds/internal/kustomize
ok  	sigs.k8s.io/kubebuilder/v4/pkg/plugins/optional/helm/v2alpha/scaffolds/internal/kustomize	0.256s
go test ./pkg/plugins/optional/helm/v2alpha/scaffolds/internal/templates
ok  	sigs.k8s.io/kubebuilder/v4/pkg/plugins/optional/helm/v2alpha/scaffolds/internal/templates	0.218s

2. Testdata
   Rather than changing the test/testdata/generate.sh, just keep it as most users may not need imagePullSecrets.
   For users who add imagePullSecrets in their kustomization under config/manager/manager.yaml, this will work nicely.

  spec:
    template:
      spec:
+       imagePullSecrets:
+         - name: ghcr-creds
        containers:
        - command:
          - /manager

This is validated with make generate-charts by applying a local change of testdata/project-v4-with-plugins/config/manager/manager.yaml

The resulting helm template of manager-deployment looks like:

+           {{- if .Values.manager.imagePullSecrets }}
+           imagePullSecrets:
+             {{- toYaml .Values.manager.imagePullSecrets | nindent 14 }}
+           {{- end }}
            securityContext:
              {{- if .Values.manager.podSecurityContext }}
              {{- toYaml .Values.manager.podSecurityContext | nindent 14 }}
              {{- else }}
              {}
              {{- end }}

Closes #5241

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: zarcen / name: Wei-Chen Chen (6f37228)

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