Scaffolder: move ContainerRunner internally

[vinzscam]

Hey, I just made a Pull Request!

Since we are moving away from @backstage/backend-common this PR moves the ContainerRunner type to scaffolder-node. Related to https://github.com/backstage/backstage/issues/24549

:heavy_check_mark: Checklist

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

[backstage-goalie[bot]]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @backstage/plugin-scaffolder-backend-module-gitlab

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/plugin-scaffolder-backend-module-cookiecutter	plugins/scaffolder-backend-module-cookiecutter	patch	v0.2.42-next.1
@backstage/plugin-scaffolder-backend-module-gitlab	plugins/scaffolder-backend-module-gitlab	none	v0.3.4-next.1
@backstage/plugin-scaffolder-backend-module-rails	plugins/scaffolder-backend-module-rails	patch	v0.4.35-next.1
@backstage/plugin-scaffolder-node	plugins/scaffolder-node	patch	v0.4.4-next.1

[github-actions[bot]]

Uffizzi Ephemeral Environment - Virtual Cluster

Your cluster pr-24612 was successfully created. Learn more about Uffizzi virtual clusters To connect to this cluster, follow these steps:

1. Download and install the Uffizzi CLI from https://docs.uffizzi.com/install
2. Login to Uffizzi, then select the backstage account and project:

   uffizzi login

Select an account: 
  ‣ backstage
    jdoe

Select a project or create a new project: 
  ‣ backstage-6783521

3. Update your kubeconfig: uffizzi cluster update-kubeconfig pr-24612 --kubeconfig=[PATH_TO_KUBECONFIG] After updating your kubeconfig, you can manage your cluster with kubectl, kustomize, helm, and other tools that use kubeconfig files: kubectl get namespace --kubeconfig [PATH_TO_KUBECONFIG]

Access the backstage endpoint at https://backstage-default-pr-24612-c5383.uclusters.app.uffizzi.com