Reverts #431

Reverts #430

Fixes #437

Fix formatting on code, where presubmits were not run.

Pulled out from #443 into
a separate PR.

```
# flux-local get cluster --path tests/testdata/cluster8/ -o yaml --enable-images  --all-namespaces
---
clusters:
- path: tests/testdata/cluster8
  kustomizations:
  - name: apps
    namespace: flux-system
    path: tests/testdata/cluster8/apps
    helm_repos: []
    helm_releases: []
    cluster_policies: []
    images:
    - alpine
  - name: flux-system
    namespace: flux-system
    path: tests/testdata/cluster8/cluster
    helm_repos: []
    helm_releases: []
    cluster_policies: []
    images: []
```
Issue #434

Follow on from #443 by also adding HelmRelease images to the manifest.
This also contains cleanup of other unused code from the initial PR
adding container images.

Issue #434

Example usage
```
$ flux-local get cluster --path tests/testdata/cluster/ -o yaml --enable-images
---
clusters:
- path: tests/testdata/cluster
  kustomizations:
  - name: apps
    namespace: flux-system
    path: tests/testdata/cluster/apps/prod
    helm_repos: []
    helm_releases:
    - name: podinfo
      namespace: podinfo
      chart:
        name: podinfo
        repo_name: podinfo
        repo_namespace: flux-system
      images:
      - public.ecr.aws/docker/library/redis:7.0.6
      - ghcr.io/stefanprodan/podinfo:6.3.2
    cluster_policies: []
  - name: flux-system
    namespace: flux-system
    path: tests/testdata/cluster/clusters/prod
    helm_repos: []
    helm_releases: []
    cluster_policies: []
  - name: infra-configs
    namespace: flux-system
    path: tests/testdata/cluster/infrastructure/configs
    helm_repos:
    - name: bitnami
      namespace: flux-system
      url: https://charts.bitnami.com/bitnami
      repo_type: default
    - name: podinfo
      namespace: flux-system
      url: oci://ghcr.io/stefanprodan/charts
      repo_type: oci
    - name: weave-charts
      namespace: flux-system
      url: oci://ghcr.io/weaveworks/charts
      repo_type: oci
    helm_releases: []
    cluster_policies:
    - name: test-allow-policy
  - name: infra-controllers
    namespace: flux-system
    path: tests/testdata/cluster/infrastructure/controllers
    helm_repos: []
    helm_releases:
    - name: metallb
      namespace: metallb
      chart:
        name: metallb
        repo_name: bitnami
        repo_namespace: flux-system
      images:
      - docker.io/bitnami/metallb-controller:0.13.7-debian-11-r29
      - docker.io/bitnami/metallb-speaker:0.13.7-debian-11-r28
    - name: weave-gitops
      namespace: flux-system
      chart:
        name: weave-gitops
        repo_name: weave-charts
        repo_namespace: flux-system
      images:
      - ghcr.io/weaveworks/wego-app:v0.24.0
    cluster_policies: []
```