Land transport shares depending on Co2L

[energyLS]

Changes proposed in this Pull Request

Provide the feature to set the land transport not depending on planning_horizons but on Co2L wildcard.

If turned on, then the BEV and FCEV shares are obtained depening on the "Co2L"-wildcard (e.g. "Co2L0.70: 0.10"). If "False", then the shares are obtained depending on the "demand" wildcard and "planning_horizons" wildcard as listed below (e.g. "DF_2050: 0.08")

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]

Note: happy to discuss wether this feature makes sense. For my scenarios it's vital, but we should only integrate it if it's of general benefit.