Added Electrolyzer Physics Tests

[elenya-grant]

Added GreenHEART Electrolyzer Physics Tests

Added on and off-grid electrolyzer physics tests

Related issue

Impacted areas of the software

Files Updated:

• greenheart/tools/eco/electrolysis.py
• tests/greenheart/test_hydrogen/input_files/plant/greenheart_config.yaml

Files Added:

• tests/greenheart/test_hydrogen/test_electrolyzer_physics.py
• tests/greenheart/test_hydrogen/input_files/plant/GS_greenheart_config.yaml
• tests/greenheart/test_hydrogen/input_files/plant/GS_gridonly_power_signal.csv
• tests/greenheart/test_hydrogen/input_files/plant/GS_offgrid_power_signal.csv

  Additional supporting information

  Part of land-based and offshore green steel code coordination and sync-up tasks. Test values are based on grid-only and off-grid land-based electrolyzer results.

Test results, if applicable

[jaredthomas68]

Also, please make sure all checks are passing before we merge this.