Remove deprecated SyGuS method evaluateWithUnfolding (#7155)

Remove deprecated SyGuS method evaluateWithUnfolding (#7155)

This was a predecessor to the evaluator and TermDbSygus::rewriteNode that is no longer necessary.

This refactors the code so that evaluateWithUnfolding is replaced by rewriteNode as necessary throughout the SyGuS solver.

Note that in a few places, the extended rewriter was being used where TermDbSygus::rewriteNode (which also evaluates recursive function definitions) should have been used.