Support for root packages for core24

[sergiusens]

What needs to get done

In the non Craft Application based snapcraft root level build-packages and stage-packages are bundled into a part before being passed to Craft Parts. This logic is missing in the new Craft Application based Snapcraft

Why it needs to get done

Implement the similar logic to

snapcraft/snapcraft/parts/yaml_utils.py

Line 186 in 8a9a5c2

# Special Snapcraft Part

and its similar unit tests which would allow tests/spread/core24/root-packages/task.yaml to pass

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-2529.

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