Parse Files saved hardcoded in json in array.

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

I have files in json. And I put that json inside of an array. But seems like parse files are saved hardcoded. Even we change fileAdapter, or baseUrl in file adapter, files return with the old url.

Steps to reproduce

Here is an example. This is How I save my files.

    for(var i = 0; i < mediaList.length; i++){
      //...other logic
    
           
      var mainmedia = new Parse.File(user.id, { base64: mediaData },mimeInfo.mime);
      var thumbfile = new Parse.File(user.id, { base64: thumbnail },mimeInfo.mime);
      

      var item = {"type":"image","width":ratiow,"height":ratioh,"media":mainmedia,"thumbnail":thumbfile};
      itemList.push(item);
    
    }
    post.set("media",itemList);

And baseUrl in my adapter is : http://files.example.com

Now file is saved with this url: http://files.example.com/filename

But If change baseUrl to this: http://my-new-file-endpoint.example.com
I still get http://files.example.com/filename but I should get http://my-new-file-endpoint.example.com/filename

Actual Outcome

I get old url
http://files.example.com/filename

Expected Outcome

I should get http://my-new-file-endpoint.example.com/filename

Failing Test Case / Pull Request

• 🤩 I submitted a PR with a fix and a test case.
• 🧐 I submitted a PR with a failing test case. (here)

Environment

Server

• Parse Server version: 4.5 //But got the same result in previous versions too
• Operating system: Ubuntu 18.04
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Remote server

Database

• System (MongoDB or Postgres): Mongodb
• Database version: 4.4
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): remote

Read Parse.File and the fileAdapter/baseUrl handling first, then inspect the failing test in PR #7124. Done means the reproduced array-of-file case returns the updated base URL after the adapter baseUrl changes, with the failing test passing.