refactor: remove use_homotopy_continuation keyword from NonlinearProblem

Author: AayushSabharwal

src/systems/nonlinear/nonlinearsystem.jl

@@ -512,17 +512,10 @@ end
 
 function DiffEqBase.NonlinearProblem{iip}(sys::NonlinearSystem, u0map,
         parammap = DiffEqBase.NullParameters();
-        check_length = true, use_homotopy_continuation = false, kwargs...) where {iip}
+        check_length = true, kwargs...) where {iip}
     if !iscomplete(sys)
         error("A completed `NonlinearSystem` is required. Call `complete` or `structural_simplify` on the system before creating a `NonlinearProblem`")
     end
-    if use_homotopy_continuation
-        prob = safe_HomotopyContinuationProblem(
-            sys, u0map, parammap; check_length, kwargs...)
-        if prob isa HomotopyContinuationProblem
-            return prob
-        end
-    end
     f, u0, p = process_SciMLProblem(NonlinearFunction{iip}, sys, u0map, parammap;
         check_length, kwargs...)
     pt = something(get_metadata(sys), StandardNonlinearProblem())