Adaptation to 2-digit GADM id, matrix alignment, mock_snakemake directory

[cpschau]

Changes proposed in this Pull Request

• Alignment of prepare_sector network with 2-digit-id which is originally received in busmap of alternatively clustered network
• Prevention of dropping column which is necessary for industry demand calculation performed in line 86.
• Directory change for successful mock_snakemake execution when debugging plot_network and plot_summary scripts
• Removal of leading whitespace, which enables assignment of tech colors for balance summary plots

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]

@cschau-ieg is this ready for review? If so, please convert the PR from draft to ready

[cpschau]

@cschau-ieg is this ready for review? If so, please convert the PR from draft to ready

I just marked it as ready. The PR was depending on #670 in pypsa-earth, which is merged by now.

[energyLS]

Looks good, changes were checked and the issue is fixed