Tests

feat: use `HomotopyContinuationProblem` in `NonlinearProblem` if possible #906

Job	Run time
Tests (1, Extended) / Tests - Extended	10m 38s
Tests (1, Downstream) / Tests - Downstream	12m 3s
Tests (1, Extensions) / Tests - Extensions	18m 54s
Tests (1, Initialization) / Tests - Initialization	16m 14s
Tests (1, InterfaceI) / Tests - InterfaceI	28m 36s
Tests (1, InterfaceII) / Tests - InterfaceII	21m 23s
Tests (1, RegressionI) / Tests - RegressionI	7m 49s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 29s
Tests (lts, Downstream) / Tests - Downstream	5m 56s
Tests (lts, Extended) / Tests - Extended	4m 57s
Tests (lts, Extensions) / Tests - Extensions	11m 7s
Tests (lts, Initialization) / Tests - Initialization	9m 38s
Tests (lts, InterfaceI) / Tests - InterfaceI	19m 27s
Tests (lts, InterfaceII) / Tests - InterfaceII	12m 47s
Tests (lts, RegressionI) / Tests - RegressionI	4m 48s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	5m 30s
Tests (pre, Downstream) / Tests - Downstream	11m 52s
Tests (pre, Extended) / Tests - Extended	10m 46s
Tests (pre, Extensions) / Tests - Extensions	18m 39s
Tests (pre, Initialization) / Tests - Initialization	15m 36s
Tests (pre, InterfaceI) / Tests - InterfaceI	28m 28s
Tests (pre, InterfaceII) / Tests - InterfaceII	21m 17s
Tests (pre, RegressionI) / Tests - RegressionI	7m 33s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 23s
	5h 26m 50s

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