perf(graph_engine): refactored recordEpsTape to reduce repeated work

previously recordADTape was duplicating a lot of work which recordEpsTape also needed to do. Now all derivs are being recorded into m_rhsADFun so that only one tape recording phase is needed per network build stage.

src/include/gridfire/engine/engine_graph.h

@@ -890,8 +890,6 @@ namespace gridfire {
          */
         void recordADTape() const;
 
-        void recordEpsADTape() const;
-
         void collectAtomicReverseRateAtomicBases();
 
         void precomputeNetwork();