fix: native login box pops up when the session expires (halo-dev/console#836)

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#### What type of PR is this?
/kind improvement
/area console
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#### What this PR does / why we need it:
添加`X-Requested-With=XMLHttpRequest`请求头，以阻止spring security 带上`WWW-Authenticate`响应头导致弹出原生登录框。
#### Which issue(s) this PR fixes:

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Fixes https://github.com/halo-dev/halo/issues/3213

#### Screenshots:

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#### Special notes for your reviewer:
使session过期后（直接删除cookie的session或重启后端），继续操作console端，预期不会弹出原生登录框且console端原有的重新登录form正常弹出。
详情https://spring.io/guides/tutorials/spring-security-and-angular-js/ 中搜索X-Requested-With
#### Does this PR introduce a user-facing change?

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```release-note
防止浏览器弹出原生登录框
```

src/utils/api-client.ts

@@ -100,6 +100,8 @@ axiosInstance.interceptors.response.use(
   }
 );
 
+axiosInstance.defaults.headers.common["X-Requested-With"] = "XMLHttpRequest";
+
 const apiClient = setupApiClient(axiosInstance);
 
 function setupApiClient(axios: AxiosInstance) {