Fix: config link type carriers

[nicolezechneraggm]

Changes proposed in this Pull Request

Bugfix: As introduced for H2 pipeline retrofitted in #2174, the link type carriers gas pipeline new and CO2 pipeline must be called to correctly address losses.

If the bidirectional links with (p_min_pu=-1) are not added here, they are not split in lossy_bidirectional_links in prepare_sector_network. They are then allowed negative flows, leading to negative marginal costs in the exporting bus and generating artificial revenue there.

Additionally, the if-gate in the lossy_bidirectional_links function triggers only if carrier_i.empty:
https://github.com/AGGM-AG/pypsa-eur/blob/f750d664f1d5f2afa4c57a3f8b4132ecdd59873f/scripts/prepare_sector_network.py#L5852-L5856

if (  
    not any((v != 1.0) or (v >= 0) for v in efficiencies.values())  
    or carrier_i.empty  
):  
    return

The first part of the condition (v != 1.0) or (v >= 0) is always True. This may be an oversight that allows the split of bidirectional links regardless of efficiency values, as long as they are given in the config.

Checklist

Required:

• Changes are tested locally and behave as expected.
• Code and workflow changes are documented.
• A release note entry is added to doc/release_notes.md.

If applicable:

• Changes in configuration options are reflected in scripts/lib/validation.
• For new data sources or versions, these instructions have been followed.
• New rules are documented in the appropriate doc/*.md files.