[java][okhttp] Add CI tests for streaming (#10678)

* add ci tests for streaming

* use spaces instead of tabs

* update samples

samples/client/others/java/okhttp-gson-streaming/docs/PingApi.md

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+# PingApi
+
+All URIs are relative to *http://localhost:8082*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**postPing**](PingApi.md#postPing) | **POST** /ping | 
+
+
+<a name="postPing"></a>
+# **postPing**
+> SomeObj postPing(someObj)
+
+
+
+### Example
+```java
+// Import classes:
+import org.openapitools.client.ApiClient;
+import org.openapitools.client.ApiException;
+import org.openapitools.client.Configuration;
+import org.openapitools.client.models.*;
+import org.openapitools.client.api.PingApi;
+
+public class Example {
+  public static void main(String[] args) {
+    ApiClient defaultClient = Configuration.getDefaultApiClient();
+    defaultClient.setBasePath("http://localhost:8082");
+
+    PingApi apiInstance = new PingApi(defaultClient);
+    SomeObj someObj = new SomeObj(); // SomeObj | 
+    try {
+      SomeObj result = apiInstance.postPing(someObj);
+      System.out.println(result);
+    } catch (ApiException e) {
+      System.err.println("Exception when calling PingApi#postPing");
+      System.err.println("Status code: " + e.getCode());
+      System.err.println("Reason: " + e.getResponseBody());
+      System.err.println("Response headers: " + e.getResponseHeaders());
+      e.printStackTrace();
+    }
+  }
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **someObj** | [**SomeObj**](SomeObj.md)|  | [optional]
+
+### Return type
+
+[**SomeObj**](SomeObj.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+**200** | OK |  -  |
+

samples/client/others/java/okhttp-gson-streaming/docs/SomeObj.md

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+
+
+# SomeObj
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**$type** | [**TypeEnum**](#TypeEnum) |  |  [optional]
+**id** | **Long** |  |  [optional]
+**name** | **String** |  |  [optional]
+**active** | **Boolean** |  |  [optional]
+**type** | **String** |  |  [optional]
+
+
+
+## Enum: TypeEnum
+
+Name | Value
+---- | -----
+SOMEOBJIDENTIFIER | "SomeObjIdentifier"
+
+
+