Improve workflow for importing packages

Background

Currently, the workflow for importing packages in Apertis is not well-defined and documented, causing developers to take different approaches based on their own judgment.

This task is about providing clear guidelines in the different scenarios and to document it.

Outcomes

TBD

Management data

This section is for management only, it should be the last one in the description.

/cc @em @Balasubramanian @sudarshan @wlozano

Phabricator link: https://phabricator.apertis.org/T10742