No longer need to pop 🍿 empty dics from `metadata.option`

[khsrali]

In PR aiidateam/aiida-core#7143, we fixed the issue of showing empty dics.

    builder['metadata']['options'].pop('stash', None)
    builder['metadata']['options'].pop('unstash', None)

This change is planned to be released via aiida-core v2.8