Tests

fix: retain system data on `structural_simplify` of `SDESystem` #892

Job	Run time
Tests (1, Extended) / Tests - Extended	4m 22s
Tests (1, Downstream) / Tests - Downstream	5m 51s
Tests (1, Extensions) / Tests - Extensions	19m 22s
Tests (1, Initialization) / Tests - Initialization	9m 16s
Tests (1, InterfaceI) / Tests - InterfaceI	21m 43s
Tests (1, InterfaceII) / Tests - InterfaceII	13m 50s
Tests (1, RegressionI) / Tests - RegressionI	3m 46s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 13s
Tests (lts, Downstream) / Tests - Downstream	10m 28s
Tests (lts, Extended) / Tests - Extended	9m 55s
Tests (lts, Extensions) / Tests - Extensions	21m 41s
Tests (lts, Initialization) / Tests - Initialization	14m 43s
Tests (lts, InterfaceI) / Tests - InterfaceI	24m 22s
Tests (lts, InterfaceII) / Tests - InterfaceII	18m 21s
Tests (lts, RegressionI) / Tests - RegressionI	7m 10s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	10m 37s
Tests (pre, Downstream) / Tests - Downstream	5m 49s
Tests (pre, Extended) / Tests - Extended	4m 26s
Tests (pre, Extensions) / Tests - Extensions	19m 42s
Tests (pre, Initialization) / Tests - Initialization	9m 29s
Tests (pre, InterfaceI) / Tests - InterfaceI	21m 47s
Tests (pre, InterfaceII) / Tests - InterfaceII	14m 40s
Tests (pre, RegressionI) / Tests - RegressionI	1m 19s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 22s
	4h 43m 14s

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