Changes to GAC model and GAC example flowsheet to solve when `MaterialFlowBasis.mass` #7430

Job	Run time
Check code is formatted (Black)	20s
Check code is formatted (Black)	20s
Code linting (pylint)	5m 48s
Code linting (pylint)	5m 48s
Tests (py3.8/linux)	28m 30s
Tests (py3.8/linux)	28m 30s
Tests (py3.8/win64)	50m 49s
Tests (py3.8/win64)	50m 49s
macOS setup (EXPERIMENTAL) (3.8)	44m 10s
macOS setup (EXPERIMENTAL) (3.8)	44m 10s
Tests (py3.9/linux)	30m 36s
Tests (py3.9/linux)	30m 36s
pytest (user mode) (py3.8/linux)	18m 9s
pytest (user mode) (py3.8/linux)	18m 9s
Tests (py3.9/win64)	46m 8s
Tests (py3.9/win64)	46m 8s
pytest (user mode) (py3.8/win64)	28m 20s
pytest (user mode) (py3.8/win64)	28m 20s
Test notebooks (py3.8/linux)	5m 2s
Test notebooks (py3.8/linux)	5m 2s
Tests (py3.10/linux)	25m 23s
Tests (py3.10/linux)	25m 23s
pytest (user mode) (py3.11/linux)	15m 7s
pytest (user mode) (py3.11/linux)	15m 7s
Test notebooks (py3.8/win64)	10m 13s
Test notebooks (py3.8/win64)	9m 38s
pytest (user mode) (py3.11/win64)	26m 16s
pytest (user mode) (py3.11/win64)	26m 16s
Tests (py3.10/win64)	51m 47s
Tests (py3.10/win64)	51m 47s
Test notebooks (py3.11/linux)	5m 0s
Test notebooks (py3.11/linux)	5m 0s
Tests (py3.11/linux)	25m 5s
Tests (py3.11/linux)	25m 5s
Test notebooks (py3.11/win64)	11m 37s
Test notebooks (py3.11/win64)	13m 49s
Tests (py3.11/win64)	53m 41s
Tests (py3.11/win64)	53m 41s
	16h 5m 39s

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