feat(app) RHIDP-1803 enable field extensions

[gashcrumb]

Description

This commit enables support for Scaffolder field extensions. A plugin can export a field extension as documented and then configure it to be included in the list of enabled scaffolder field extensions using the following configuration:

dynamicPlugins:
  frontend:
    my-plugin:
      scaffolderFieldExtensions:
        - importName: SomeExportedFieldExtension

Which issue(s) does this PR fix

• Fixes RHIDP-1803
• Fixes #1146

PR acceptance criteria

Please make sure that the following steps are complete:

• [ ] GitHub Actions are completed and successful
• [ ] Unit Tests are updated and passing
• [ ] E2E Tests are updated and passing
• [ ] Documentation is updated if necessary (requirement for new features)
• [ ] Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

There's a really simple extension in this package that can be used for a quick test. You can import this template and then use this configuration:

dynamicPlugins:
  frontend:
    backstage-plugin-simple-test-components:
      scaffolderFieldExtensions:
        - importName: SimpleTestFieldExtension

[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[github-actions[bot]]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1253!

[davidfestal]

/approve

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[davidfestal]

/lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidfestal

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[github-actions[bot]]

The image is available at: quay.io/janus-idp/backstage-showcase:pr-1253!

[cmoulliard]

We cannot retest the image published as we got such issues using guest auth provider. See screenshots hereafter

[cmoulliard]

I was able to launch janus-idp locally using as auth provider .... github

auth:
  environment: development
  providers:
    #  guest: {}
    github:
      development:
        clientId: fde4...080e
        clientSecret: 8ba...0f20

The fieldExtensions are working if we add as config

dynamicPlugins:
  rootDirectory: dynamic-plugins-root
  frontend:
    qshift.plugin-quarkus:
      scaffolderFieldExtensions:
      - importName: QuarkusExtensionListField
      - importName: QuarkusVersionListField
      - importName: QuarkusQuickstartPickerField

[gashcrumb]

That's great news @cmoulliard! This will need plenty of testing as I've only tried the most minimal use case, so raise issues if you run into anything. Thanks!