Use of the devfile universal images in Che samples

[benoitf]

Is your enhancement related to a problem? Please describe

• The number of images to maintain: we have almost a distinct image for each of our samples and plugins
• We do not have a default image for component-less workspaces (we currently use Theia sidecar, that’s ok for nodejs but for the rest?)
• To cache our sample images for faster startup we need to pre-pull 20+ images on every single node of the cluster
• Developers should not leave a workspace to use a command line tool (for example while coding in Java a developer may want use python or kubectl)
• The images for the samples and plugins need to be kept in sync

Describe the solution you'd like

• Define a Universal Developer Image that include every tool required
  • by the commands in our samples
  • by the vs extensions included in our samples
  • by the top 10 VS Code extensions in the marketplace
• Use the Universal Developer image as the main component of every sample devfile
• When Theia is the editor: run the extensions in the main devfile component
• When VS Code is the editor: run both the editor and the extensions in the main devfile component
• When IntelliJ is the editor: run the editor in the main devfile component

Additional context

We should update only Devfile v2 examples
We should continue to build the plugins sidecar images for when the developer specify sidecar-policy: MERGE_IMAGE

[che-bot]

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