tests: add logic scenario helpers

[filiplajszczak]

Add shared helpers for logic scenario tests and convert the min grid-charge live-case tests to use them.

This reduces repeated CommonLogic, CalculationInput, and SoC setup, making future price-window/grid-charge characterization tests easier to read.

[MaStr]

@filiplajszczak Can you solve the conflict please? I can also push the Copilot to do it. As you wish

[Copilot]

Pull request overview

Adds shared helper utilities for battery-control logic scenario tests and refactors the “min grid-charge SoC” live-case regression tests to use those helpers, reducing repetitive setup and making future scenario characterization tests more readable.

Changes:

• Introduce tests/batcontrol/logic/helpers.py with shared constants plus make_logic, make_calc_input, and target_usable_energy.
• Add tests/batcontrol/logic/conftest.py autouse fixture to reset the CommonLogic singleton between tests.
• Refactor test_min_grid_charge_soc_live_cases.py to use the new helpers and remove duplicated local setup functions/constants.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/batcontrol/logic/test_min_grid_charge_soc_live_cases.py	Uses shared helpers for scenario setup; removes duplicated singleton reset + input/logic builders.
tests/batcontrol/logic/helpers.py	New shared helper functions/constants for constructing logic instances and calculation inputs.
tests/batcontrol/logic/conftest.py	New autouse fixture to reset CommonLogic singleton between tests in this test package.

[MaStr]

@filiplajszczak Thank you