Tests

fix: fix initialization of `DiscreteProblem(::JumpSystem)` #1033

Job	Run time
Tests (1, Downstream) / Tests - Downstream	21m 20s
Tests (1, Extended) / Tests - Extended	16m 57s
Tests (1, Extensions) / Tests - Extensions	33m 33s
Tests (1, Initialization) / Tests - Initialization	29m 40s
Tests (1, InterfaceI) / Tests - InterfaceI	36m 6s
Tests (1, InterfaceII) / Tests - InterfaceII	29m 47s
Tests (1, RegressionI) / Tests - RegressionI	14m 40s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	18m 19s
Tests (lts, Downstream) / Tests - Downstream	9m 45s
Tests (lts, Extended) / Tests - Extended	9m 14s
Tests (lts, Extensions) / Tests - Extensions	18m 38s
Tests (lts, InterfaceI) / Tests - InterfaceI	22m 19s
Tests (lts, Initialization) / Tests - Initialization	17m 45s
Tests (lts, InterfaceII) / Tests - InterfaceII	16m 50s
Tests (lts, RegressionI) / Tests - RegressionI	4m 36s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	7m 52s
Tests (pre, Downstream) / Tests - Downstream	21m 1s
Tests (pre, Extended) / Tests - Extended	16m 58s
Tests (pre, Extensions) / Tests - Extensions	25m 52s
Tests (pre, Initialization) / Tests - Initialization	31m 14s
Tests (pre, InterfaceI) / Tests - InterfaceI	36m 14s
Tests (pre, InterfaceII) / Tests - InterfaceII	30m 48s
Tests (pre, RegressionI) / Tests - RegressionI	13m 48s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	17m 51s
	8h 21m 7s

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