Fixes # .

Summary/Motivation:

Starting in Gurobi 12.0.0, Gurobi no longer distributes the AMPL interface binary. The interface is now distributed by AMPL through a different channel. However, as part of this change, the name of the executable has changed from gurobi_ampl to just gurobi. This PR tracks that change by having the Gurobi NL interface first look for gurobi, then fall back on gurobi_ampl. Because of the high probability of running into other executables names "gurobi", in addition to looking for a executable file, we will also check that the file appears to be the NL bindings by executing it and looking for a specific string ([-AMPL]) from the ASL usage message.

Changes proposed in this PR:

• Look for gurobi and gurobi_ampl executables when instantiating the Gurobi NL solver interface.

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