Tests

fix: retain system data on `structural_simplify` of `SDESystem` #891

Job	Run time
Tests (1, Extended) / Tests - Extended	12m 59s
Tests (1, Downstream) / Tests - Downstream	11m 43s
Tests (1, Initialization) / Tests - Initialization	15m 31s
Tests (1, Extensions) / Tests - Extensions	24m 56s
Tests (1, InterfaceI) / Tests - InterfaceI	28m 18s
Tests (1, InterfaceII) / Tests - InterfaceII	21m 3s
Tests (1, RegressionI) / Tests - RegressionI	7m 51s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 19s
Tests (lts, Extensions) / Tests - Extensions	23m 1s
Tests (lts, Downstream) / Tests - Downstream	10m 46s
Tests (lts, Extended) / Tests - Extended	9m 48s
Tests (lts, Initialization) / Tests - Initialization	14m 41s
Tests (lts, InterfaceI) / Tests - InterfaceI	24m 23s
Tests (lts, InterfaceII) / Tests - InterfaceII	17m 12s
Tests (lts, RegressionI) / Tests - RegressionI	7m 5s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	10m 14s
Tests (pre, Downstream) / Tests - Downstream	5m 32s
Tests (pre, Extended) / Tests - Extended	4m 11s
Tests (pre, Extensions) / Tests - Extensions	19m 45s
Tests (pre, Initialization) / Tests - Initialization	8m 47s
Tests (pre, InterfaceI) / Tests - InterfaceI	21m 36s
Tests (pre, InterfaceII) / Tests - InterfaceII	13m 42s
Tests (pre, RegressionI) / Tests - RegressionI	1m 21s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 1s
	5h 30m 45s

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