scaffolder: extract ui:* fields from conditional fields.

[Andy2003]

With this change the ui:* schema config is extracted also for the then and else branch of a conditional schema.

Example schema:

parameters:
  - title: Fill in some steps
    properties:
      useUser:
        title: Use existing User
        type: boolean
    if:
      properties:
        useUser:
          const: true
    then:
      properties:
        user:
          type: string
          ui:field: EntityPicker
          ui:options:
            catalogFilter:
              - kind: User
    else:
      properties:
        name:
          type: string
        email:
          type: string

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)
• All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/plugin-scaffolder-react	plugins/scaffolder-react	patch	v1.4.0-next.2

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[Andy2003]

Do not close. Still waiting for review.

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[Andy2003]

Do not close. Still waiting for review.

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[Andy2003]

@Rugvip Is there any plan to review this PR?

[Rugvip]

@Andy2003 not until now 😅 somehow the GitHub automation failed to add it to our project board. Fixed that and will have a look in a bit

[Rugvip]

Nice, makes sense, thank you! 🎉

Sorry about the delay, I'm gonna see if we can get some system in place to catch those hiccups

[github-actions]

Thank you for contributing to Backstage! The changes in this pull request will be part of the 1.15.0 release, scheduled for Tue, 20 Jun 2023.