Tests

[v10] refactor: use `ImplicitDiscreteSystem` to implement affects in callback systems #1555

Job	Run time
Tests (1, Downstream) / Tests - Downstream	15m 8s
Tests (1, Extended) / Tests - Extended	8m 33s
Tests (1, FMI) / Tests - FMI	14m 5s
Tests (1, Extensions) / Tests - Extensions	16m 15s
Tests (1, Initialization) / Tests - Initialization	16m 20s
Tests (1, InterfaceI) / Tests - InterfaceI	16m 15s
Tests (1, InterfaceII) / Tests - InterfaceII	16m 15s
Tests (1, RegressionI) / Tests - RegressionI	4m 49s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 54s
Tests (lts, Downstream) / Tests - Downstream	15m 59s
Tests (lts, Extended) / Tests - Extended	10m 42s
Tests (lts, FMI) / Tests - FMI	16m 15s
Tests (lts, Extensions) / Tests - Extensions	16m 14s
Tests (lts, Initialization) / Tests - Initialization	16m 13s
Tests (lts, InterfaceI) / Tests - InterfaceI	16m 15s
Tests (lts, InterfaceII) / Tests - InterfaceII	16m 15s
Tests (lts, RegressionI) / Tests - RegressionI	7m 30s
Tests (pre, Downstream) / Tests - Downstream	14m 52s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	8m 36s
Tests (pre, Extended) / Tests - Extended	8m 19s
Tests (pre, Extensions) / Tests - Extensions	16m 15s
Tests (pre, FMI) / Tests - FMI	14m 0s
Tests (pre, Initialization) / Tests - Initialization	16m 13s
Tests (pre, InterfaceI) / Tests - InterfaceI	16m 14s
Tests (pre, InterfaceII) / Tests - InterfaceII	16m 12s
Tests (pre, RegressionI) / Tests - RegressionI	7m 14s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 48s
	5h 52m 40s

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