Handle dependencies between sidecars in plugin-registry

[benoitf]

Is your task related to a problem? Please describe.

Some sidecars in che-plugin-registry are dependent from other sidecars.
For now it requires a 2-step phase where base image is updated and then child image can be updated

Describe the solution you'd like

Handle automatically internal dependencies between sidecars of the same repository in one phase.

Describe alternatives you've considered

ready to listen for other proposals

Additional context

as monorepo, the idea behind is that in one single PR you can update several items at once.

Part of #15819

[sleshchenko]

assigning p1 since it's what the related epic has

[ericwill]

Couldn't dependabot handle most of this for us?

[che-bot]

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Mark the issue as fresh with /remove-lifecycle stale in a new comment.

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Moderators: Add lifecycle/frozen label to avoid stale mode.