Tests

[v10] refactor: use `ImplicitDiscreteSystem` to implement affects in callback systems #1577

Job	Run time
Tests (1, Extended) / Tests - Extended	10m 27s
Tests (1, Downstream) / Tests - Downstream	17m 38s
Tests (1, FMI) / Tests - FMI	14m 52s
Tests (1, Extensions) / Tests - Extensions	31m 6s
Tests (1, Initialization) / Tests - Initialization	21m 17s
Tests (1, InterfaceI) / Tests - InterfaceI	32m 56s
Tests (1, InterfaceII) / Tests - InterfaceII	30m 42s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 53s
Tests (1, RegressionI) / Tests - RegressionI	7m 21s
Tests (lts, Downstream) / Tests - Downstream	18m 12s
Tests (lts, Extended) / Tests - Extended	10m 58s
Tests (lts, Extensions) / Tests - Extensions	26m 7s
Tests (lts, FMI) / Tests - FMI	15m 59s
Tests (lts, Initialization) / Tests - Initialization	20m 3s
Tests (lts, InterfaceI) / Tests - InterfaceI	29m 12s
Tests (lts, InterfaceII) / Tests - InterfaceII	36m 12s
Tests (lts, RegressionI) / Tests - RegressionI	7m 53s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 30s
Tests (pre, Downstream) / Tests - Downstream	17m 26s
Tests (pre, Extended) / Tests - Extended	10m 17s
Tests (pre, Extensions) / Tests - Extensions	30m 43s
Tests (pre, FMI) / Tests - FMI	15m 5s
Tests (pre, Initialization) / Tests - Initialization	20m 43s
Tests (pre, InterfaceI) / Tests - InterfaceI	31m 56s
Tests (pre, InterfaceII) / Tests - InterfaceII	31m 26s
Tests (pre, RegressionI) / Tests - RegressionI	9m 46s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 41s
	8h 53m 21s

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