feat: import scaffolder layouts as dynamic frontend plugin (RHDH 1.3)

[sbem44]

Description

This change enable to load ScaffolderLayouts as a frontend dynamic plugin.
To maintain consistency with ScaffolderFieldExtensions, the configuration is the following:

dynamicPlugins:
  frontend:
    backstage-plugin-simple-test-components:
      scaffolderLayouts:
        - importName: TwoColumnLayout

Which issue(s) does this PR fix

• [Jira RFE RHIDP-4703](https://issues.redhat.com/browse/RHIDP-4703)

How to test changes

Import plugin

Import and enable the attached plugin backstage-plugin-simple-layout-plugin-dynamic-0.1.0.tgz:

1. Untar the plugin;
2. copy the untar folder intodynamic-plugins;
3. copy the untar folder intodynamic-plugins-root;

Test

• open "Administration" => "Plugins" and check that the plugin is listed here;

• open "Create" => "Template editor" => "Edit template form" , past this template and check if the preview is a 2 column layout

parameters:
  - title: Component Information
    ui:ObjectFieldTemplate: TwoColumn
    properties:
      componentName:
        title: Component Name
        type: string
        description: component name
        ui:field: EntityPicker
        ui:options:
          catalogFilter:
            - kind: Component
      branchName:
        title: Branch Name
        type: string
        description: branch where to apply the change
      deployingPlatform:
        title: Deploying Platform
        type: string
        description: Platform to deploy to (Tanzu or Openshift)
        enum:
          - Openshift
          - Tanzu
        uniqueItems: true

[openshift-merge-robot]

PR needs rebase.

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[openshift-ci]

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[openshift-ci]

Hi @sbem44. Thanks for your PR.

I'm waiting for a janus-idp member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[sonarcloud]

Quality Gate failed

Failed conditions
6.3% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud