Remove H2 and battery related techs from elec-only model before re-addition

[yerbol-akhmetov]

Changes proposed in this Pull Request

Good day. This PR aims to help organization of H2 and battery addition to sector network. Currently, H2 electrolysis, H2 Fuel cell, battery charger and battery discharger links are added in add_extra_components and then re-added in prepare_sector_network. As a result, the second time it shows pypsa warning (error that components already exist). This PR aims to remove H2 and battery related components from electricity-only network, so that addition in sector script will be smooth.

One option what I thought was addition of if/else statements to ensure adding buses, links, and stores if it does not exist. But that approach is not clean in terms of code, as a lot of ifs need to be added. Also addition of H2 and battery related techs (links) will be accomplished in different scripts and functions, which might make it slightly difficult to debug.

Also removing them first from electricity network, and adding as a whole function will make it more consistent. As everything will be added with add_hydrogen and add_storage functions.
@davide-f

Checklist

• I consent to the release of this PR's code under the AGPLv3 license and non-code contributions under CC0-1.0 and CC-BY-4.0.
• I tested my contribution locally and it seems to work fine.
• A note for the release notes doc/release_notes.rst is amended in the format of previous release notes, including reference to the requested PR.

[davide-f]

Hello @yerbol-akhmetov ,

Many thanks! To me this approach seems reasonable. A quick, simple but robust solution

[davide-f]

Contributions are great and useful.
CI on sector coupled model changes slightly due to the intended feature that is added.
Merging. Many thanks @yerbol-akhmetov :D

[davide-f]

@yerbol-akhmetov sorry, last point. Can you add a major contribution to the release_note?