Tests

fix: fix initialization of `DiscreteProblem(::JumpSystem)` #1022

Job	Run time
Tests (1, Downstream) / Tests - Downstream	21m 33s
Tests (1, Extended) / Tests - Extended	17m 10s
Tests (1, Extensions) / Tests - Extensions	33m 29s
Tests (1, Initialization) / Tests - Initialization	26m 43s
Tests (1, InterfaceI) / Tests - InterfaceI	34m 40s
Tests (1, InterfaceII) / Tests - InterfaceII	28m 52s
Tests (1, RegressionI) / Tests - RegressionI	13m 46s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	18m 23s
Tests (lts, Downstream) / Tests - Downstream	12m 10s
Tests (lts, Extended) / Tests - Extended	7m 12s
Tests (lts, Extensions) / Tests - Extensions	19m 13s
Tests (lts, Initialization) / Tests - Initialization	15m 3s
Tests (lts, InterfaceI) / Tests - InterfaceI	22m 30s
Tests (lts, InterfaceII) / Tests - InterfaceII	16m 25s
Tests (lts, RegressionI) / Tests - RegressionI	4m 39s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	7m 38s
Tests (pre, Downstream) / Tests - Downstream	20m 42s
Tests (pre, Extended) / Tests - Extended	17m 17s
Tests (pre, Extensions) / Tests - Extensions	26m 10s
Tests (pre, Initialization) / Tests - Initialization	26m 37s
Tests (pre, InterfaceI) / Tests - InterfaceI	35m 45s
Tests (pre, InterfaceII) / Tests - InterfaceII	29m 28s
Tests (pre, RegressionI) / Tests - RegressionI	13m 57s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	18m 8s
	8h 7m 30s

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