✨ use labels from linked issues on created pull request

[candoumbe]

Is your feature request related to a problem? Please describe.
When finishing a feature / chore / coldfix, the pipeline CLI allows to pass a --issues parameter which instructs to link the pull request to one or more issues.
Most repositories allow to link an issue / task using some kind of labels.

Describe the solution you'd like
When creating a pull request that is linked to some issues, copy labels from those issues so that the pull request can be retrieved using same labels as the one that are on linked issues

Describe alternatives you've considered
N/A

Additional context
N/A