Tests

fix: retain observed equations after `structural_simplify` of `SDESystem` #861

Job	Run time
Tests (1, Downstream) / Tests - Downstream	17m 49s
Tests (1, Extended) / Tests - Extended	16m 58s
Tests (1, Extensions) / Tests - Extensions	24m 34s
Tests (1, Initialization) / Tests - Initialization	20m 27s
Tests (1, InterfaceI) / Tests - InterfaceI	34m 11s
Tests (1, InterfaceII) / Tests - InterfaceII	25m 52s
Tests (1, RegressionI) / Tests - RegressionI	13m 31s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	17m 50s
Tests (lts, Downstream) / Tests - Downstream	10m 44s
Tests (lts, Extended) / Tests - Extended	10m 19s
Tests (lts, Extensions) / Tests - Extensions	20m 44s
Tests (lts, Initialization) / Tests - Initialization	13m 34s
Tests (lts, InterfaceI) / Tests - InterfaceI	24m 10s
Tests (lts, InterfaceII) / Tests - InterfaceII	16m 56s
Tests (lts, RegressionI) / Tests - RegressionI	9m 15s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	10m 7s
Tests (pre, Extended) / Tests - Extended	16m 31s
Tests (pre, Downstream) / Tests - Downstream	17m 52s
Tests (pre, Extensions) / Tests - Extensions	31m 31s
Tests (pre, Initialization) / Tests - Initialization	20m 35s
Tests (pre, InterfaceI) / Tests - InterfaceI	33m 23s
Tests (pre, InterfaceII) / Tests - InterfaceII	26m 42s
Tests (pre, RegressionI) / Tests - RegressionI	13m 41s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	17m 22s
	7h 44m 38s

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