fix: properly handle rational functions in HomotopyContinuation #920

Job	Run time
Tests (1, Downstream) / Tests - Downstream	8m 31s
Tests (1, Extended) / Tests - Extended	6m 43s
Tests (1, Extensions) / Tests - Extensions	14m 45s
Tests (1, Initialization) / Tests - Initialization	11m 45s
Tests (1, InterfaceII) / Tests - InterfaceII	17m 11s
Tests (1, InterfaceI) / Tests - InterfaceI	23m 46s
Tests (1, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	7m 48s
Tests (1, RegressionI) / Tests - RegressionI	6m 4s
Tests (lts, Downstream) / Tests - Downstream	8m 37s
Tests (lts, Extended) / Tests - Extended	7m 27s
Tests (lts, Extensions) / Tests - Extensions	14m 14s
Tests (lts, Initialization) / Tests - Initialization	13m 13s
Tests (lts, InterfaceI) / Tests - InterfaceI	21m 10s
Tests (lts, InterfaceII) / Tests - InterfaceII	14m 42s
Tests (lts, RegressionI) / Tests - RegressionI	5m 13s
Tests (lts, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	8m 22s
Tests (pre, Downstream) / Tests - Downstream	8m 6s
Tests (pre, Extended) / Tests - Extended	6m 36s
Tests (pre, Extensions) / Tests - Extensions	22m 1s
Tests (pre, InterfaceI) / Tests - InterfaceI	23m 36s
Tests (pre, Initialization) / Tests - Initialization	11m 26s
Tests (pre, InterfaceII) / Tests - InterfaceII	16m 8s
Tests (pre, RegressionI) / Tests - RegressionI	3m 36s
Tests (pre, SymbolicIndexingInterface) / Tests - SymbolicIndexingInterface	8m 4s
	4h 49m 4s

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