Tests

fix: only add observed equations to affect system if there are algebraic equations in the system #2715

Job	Run time
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	24m 14s
Tests (lts, Extended) / Tests - Extended	11m 22s
Tests (1, InterfaceI) / Tests - InterfaceI	52m 30s
Tests (pre, FMI) / Tests - FMI	30m 51s
Tests (1, Extended) / Tests - Extended	19m 28s
Tests (lts, Initialization) / Tests - Initialization	23m 39s
Tests (1, FMI) / Tests - FMI	32m 53s
Tests (lts, InterfaceII) / Tests - InterfaceII	45m 56s
Tests (lts, Extensions) / Tests - Extensions	31m 28s
Tests (lts, Downstream) / Tests - Downstream	12m 35s
Tests (lts, RegressionI) / Tests - RegressionI	8m 46s
Tests (pre, InterfaceI) / Tests - InterfaceI	50m 17s
Tests (1, Extensions) / Tests - Extensions	56m 53s
Tests (1, Downstream) / Tests - Downstream	22m 4s
Tests (1, RegressionI) / Tests - RegressionI	17m 5s
Tests (lts, FMI) / Tests - FMI	17m 55s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	16m 31s
Tests (pre, InterfaceII) / Tests - InterfaceII	1h 7m 35s
Tests (pre, RegressionI) / Tests - RegressionI	17m 24s
Tests (1, InterfaceII) / Tests - InterfaceII	1h 4m 59s
Tests (1, Initialization) / Tests - Initialization	37m 29s
Tests (lts, InterfaceI) / Tests - InterfaceI	35m 9s
Tests (pre, Initialization) / Tests - Initialization	38m 34s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	24m 49s
Tests (pre, Extensions) / Tests - Extensions	16m 48s
Tests (pre, Downstream) / Tests - Downstream	21m 51s
Tests (pre, Extended) / Tests - Extended	20m 18s
	13h 39m 23s

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