Retrieve costs automatically

[energyLS]

Changes proposed in this Pull Request

Previously, the costs for 2030 were stored in the repo ìn the data/ folder. These costs are now removed and replaced by an automized download depending on the wildcard planning_horizon. The version of the cost data can be adjusted in the config.yaml and is currently set to the latest release https://github.com/PyPSA/technology-data/releases/tag/v0.6.2.

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Newly introduced dependencies are added to envs/environment.yaml and envs/environment.docs.yaml.
• Changes in configuration options are added in all of config.default.yaml, config.tutorial.yaml, and test/config.test1.yaml.
• Changes in configuration options are also documented in doc/configtables/*.csv and line references are adjusted in doc/configuration.rst and doc/tutorial.rst.
• 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.

[energyLS]

@hazemakhalek should we note this in the release notes? Currently we don't have them automized