Add dependency check to make sure child devfiles are being tested when parent stack has been changed

[elsony]

Which area/kind this issue is related to?

/area registry

Issue Description

The current PR tests in the devfile registry only test for stacks/samples that have been changed. However, if there are other stacks/samples referring to the changed stacks as parents, the child stacks/samples test does not run. There is a risk in case the parent stack change may break the depending stacks/samples.

We need to:

1. Set up a dependency tree (auto-generated based on the current registry contents) so that we can easily find out the depending stacks/samples of a given stack.
2. Triggers the child stacks/samples test as part of the PR tests of the parent stacks

Target Odo version

N/A

[michael-valdron]

The initial dependency check work for current child samples is now being tracked under #1142, this issue will now track the continuation of that work to expand to considering additional child stacks/samples not yet part of the community registry.

[github-actions]

This issue is stale because it has been open for 90 days with no activity. Remove stale label or comment or this will be closed in 60 days.