[erlang-client] Apply var/param name mappings (#18662) (#18859)

Fixes #18662

Author: valpackett

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ErlangClientCodegen.java

@@ -251,6 +251,10 @@ public String modelFileFolder() {
 
     @Override
     public String toVarName(String name) {
+        if (nameMapping.containsKey(name)) {
+            return nameMapping.get(name);
+        }
+
         // replace - with _ e.g. created-at => created_at
         name = sanitizeName(name.replaceAll("-", "_"));
         // for reserved word or word starting with number, append _
@@ -262,6 +266,10 @@ public String toVarName(String name) {
 
     @Override
     public String toParamName(String name) {
+        if (parameterNameMapping.containsKey(name)) {
+            return parameterNameMapping.get(name);
+        }
+
         return camelize(toVarName(name));
     }