[Inline model resolver] better handling of inline responses and bug fixes (#12353)

* better handling of inline response schemas, bug fixes

* update samples

* add new files

* better code format

* remove unused ruby files

* fix java test

* remove unused js spec files

* remove inline_response_default_test.dart

* fix webclient tests

* fix spring tests

samples/client/petstore/php/OpenAPIClient-php/test/Model/FooGetDefaultResponseTest.php

@@ -0,0 +1,90 @@
+<?php
+/**
+ * FooGetDefaultResponseTest
+ *
+ * PHP version 7.3
+ *
+ * @category Class
+ * @package  OpenAPI\Client
+ * @author   OpenAPI Generator team
+ * @link     https://openapi-generator.tech
+ */
+
+/**
+ * OpenAPI Petstore
+ *
+ * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
+ *
+ * The version of the OpenAPI document: 1.0.0
+ * Generated by: https://openapi-generator.tech
+ * OpenAPI Generator version: 6.0.0-SNAPSHOT
+ */
+
+/**
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Please update the test case below to test the model.
+ */
+
+namespace OpenAPI\Client\Test\Model;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * FooGetDefaultResponseTest Class Doc Comment
+ *
+ * @category    Class
+ * @description FooGetDefaultResponse
+ * @package     OpenAPI\Client
+ * @author      OpenAPI Generator team
+ * @link        https://openapi-generator.tech
+ */
+class FooGetDefaultResponseTest extends TestCase
+{
+
+    /**
+     * Setup before running any test case
+     */
+    public static function setUpBeforeClass(): void
+    {
+    }
+
+    /**
+     * Setup before running each test case
+     */
+    public function setUp(): void
+    {
+    }
+
+    /**
+     * Clean up after running each test case
+     */
+    public function tearDown(): void
+    {
+    }
+
+    /**
+     * Clean up after running all test cases
+     */
+    public static function tearDownAfterClass(): void
+    {
+    }
+
+    /**
+     * Test "FooGetDefaultResponse"
+     */
+    public function testFooGetDefaultResponse()
+    {
+        // TODO: implement
+        $this->markTestIncomplete('Not implemented');
+    }
+
+    /**
+     * Test attribute "string"
+     */
+    public function testPropertyString()
+    {
+        // TODO: implement
+        $this->markTestIncomplete('Not implemented');
+    }
+}