Tighten constraint on usage of global vars

[FabianHofmann]

Follow up on #1537

Changes proposed in this Pull Request

Some cases were not checked by the CI. With this we should be save to easily distribute functions across modules

Checklist

• I tested my contribution locally and it works as intended.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to envs/environment.yaml.
• Changes in configuration options are added in config/config.default.yaml.
• Changes in configuration options are documented in doc/configtables/*.csv.
• Sources of newly added data are documented in doc/data_sources.rst.
• A release note doc/release_notes.rst is added.

PR Overview

This PR aims to tighten constraints on the usage of global variables and to improve function interfaces for better modularity. Key changes include updating function signatures (e.g. adding a new social discount parameter and passing through the current investment years), and consistently adding pylint disable comments (E0606) for calls to configure_logging.

Reviewed Changes

File	Description
scripts/solve_operations_network.py	Added pylint disable comment when calling configure_logging.
scripts/prepare_perfect_foresight.py	Updated concat_networks and set_all_phase_outs signatures and their calls.
scripts/add_brownfield.py	Added pylint disable comment when calling configure_logging.
scripts/prepare_osm_network_release.py	Updated create_geometries signature to include is_converter and logging fix.
scripts/add_existing_baseyear.py	Replaced a log warning with a raise ValueError for undefined heat systems.
scripts/add_transmission_projects_and_dlr.py	Added pylint disable comment when calling configure_logging.
scripts/add_electricity.py	Added pylint disable comment and introduced an explicit error branch.
.github/workflows/test.yaml	Updated pylint command to enable E0606 along with E0601.
scripts/prepare_network.py	Added pylint disable comment when calling configure_logging.

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (3)

scripts/prepare_perfect_foresight.py:626

• [nitpick] Consider renaming the parameter 'social_discountrate' to 'social_discount_rate' for improved readability and clarity.

n = concat_networks(years, network_paths, social_discountrate)

scripts/add_existing_baseyear.py:460

• Replacing a log warning with an exception can affect control flow; please ensure this exception is properly handled in callers so that unexpected termination is avoided.

raise ValueError(f"Heat system {heat_system} not defined.")

scripts/add_electricity.py:775

• [nitpick] Ensure that all valid cases for 'hydro_max_hours' are covered upstream; this exception should only be raised when an unexpected method is encountered to prevent unintended termination.

raise ValueError(f"Unknown hydro_max_hours method: {hydro_max_hours}")