optbuilder: reset annotations when building CREATE FUNCTION

In 22dabb0 we started overriding the annotations for each statement
in the UDF body. We should reset them to the original values, so we
don't accidentally leave the old reference.

Release note: None

pkg/sql/opt/optbuilder/create_function.go

@@ -207,6 +207,10 @@ func (b *Builder) buildCreateFunction(cf *tree.CreateFunction, inScope *scope) (
 		// Reset the tracked dependencies for next statement.
 		b.schemaDeps = nil
 		b.schemaTypeDeps = intsets.Fast{}
+
+		// Reset the annotations to the original values
+		b.evalCtx.Annotations = oldEvalCtxAnn
+		b.semaCtx.Annotations = oldSemaCtxAnn
 	}
 
 	if targetVolatility == tree.FunctionImmutable && len(deps) > 0 {