Tests

feat: use `HomotopyContinuationProblem` in `NonlinearProblem` if possible #905

Job	Run time
Tests (1, Downstream) / Tests - Downstream	11m 54s
Tests (1, Extensions) / Tests - Extensions	18m 50s
Tests (1, Initialization) / Tests - Initialization	15m 5s
Tests (1, Extended) / Tests - Extended	10m 30s
Tests (1, InterfaceI) / Tests - InterfaceI	28m 22s
Tests (1, InterfaceII) / Tests - InterfaceII	20m 33s
Tests (1, RegressionI) / Tests - RegressionI	7m 36s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 25s
Tests (lts, Downstream) / Tests - Downstream	10m 25s
Tests (lts, Extended) / Tests - Extended	9m 51s
Tests (lts, Extensions) / Tests - Extensions	21m 38s
Tests (lts, Initialization) / Tests - Initialization	14m 16s
Tests (lts, InterfaceI) / Tests - InterfaceI	24m 30s
Tests (lts, InterfaceII) / Tests - InterfaceII	17m 14s
Tests (lts, RegressionI) / Tests - RegressionI	9m 32s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	10m 6s
Tests (pre, Downstream) / Tests - Downstream	11m 38s
Tests (pre, Extended) / Tests - Extended	10m 36s
Tests (pre, Extensions) / Tests - Extensions	26m 31s
Tests (pre, Initialization) / Tests - Initialization	15m 32s
Tests (pre, InterfaceI) / Tests - InterfaceI	28m 15s
Tests (pre, InterfaceII) / Tests - InterfaceII	20m 33s
Tests (pre, RegressionI) / Tests - RegressionI	7m 42s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	11m 41s
	6h 14m 15s

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