chore(codegen): remove unnecessary function

Author: WipeAir

graphql-kotlin-toolkit-codegen/src/main/kotlin/com/auritylab/graphql/kotlin/toolkit/codegen/mapper/GeneratedMapper.kt

@@ -54,12 +54,6 @@ internal class GeneratedMapper(
     fun getValueWrapperName(): ClassName =
         buildClassName("V", "util")
 
-    /**
-     * Will return the [ClassName] for the environment wrapper.
-     */
-    fun getEnvironmentWrapperClassName(): ClassName =
-        buildClassName("Env", "util")
-
     /**
      * Will return the [MemberName] of the builder method for the given [inputObject].
      */